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Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.Early peoples had no need of engineering works to supply their water. Hunters and nomads camped near natural sources of fresh water, and populations were so sparse that pollution of the water supply was not a serious problem. After community life developed and agricultural villages became urban centres, the problem of supplying water became important for inhabitants of a city, as well as for irrigation of the farms surrounding the city. Irrigation works were known in prehistoric times, and before 2000 BC the rulers of Babylonia and Egypt constructed systems of dams and canals to impound the flood waters of the Euphrates and Nile rivers, controlling floods and providing irrigation water throughout the dry season. Such irrigation canals also supplied water for domestic purposes. The first people to consider the sanitation of their water supply were the ancient Romans, who constructed a vast system of aqueducts to bring the clean waters of the Apennine Mountains into the city and built basins and filters along these mains to ensure the clarity of the water. The construction of such extensive water-supply systems declined when the Roman Empire disintegrated, and for several centuries local springs and wells formed the main source of domestic and industrial water.The invention of the force pump in England in the middle of the 16th century greatly extended the possibilities of development of water-supply systems. In London, the first pumping waterworks was completed in 1562; it pumped river water to a reservoir about 37 m above the level of the River Thames and from the reservoir the water was distributed by gravity, through lead pipes, to buildings in the vicinity.Increased per-capita demand has coincided with water shortages in many countries. Southeast England, for example, receives only 14 per cent of Britain's rainfall, has 30 per cent of its population, and has experienced declining winter rainfall since the 1980s.In recent years a great deal of interest has been shown in the conversion of seawater to fresh water to provide drinking water for very dry areas, such as the Middle East. Several different processes, including distillation, electrodialysis, reverse osmosis, and direct-freeze evaporation, have been developed for this purpose. Some of these processes have been used in large facilities in the United States. Although these processes are successful, the cost of treating seawater is much higher than that for treating fresh waterThe word “impound” in paragraph 1 is closest in meaning to ______

Xem chi tiết 1.5 K lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.Early peoples had no need of engineering works to supply their water. Hunters and nomads camped near natural sources of fresh water, and populations were so sparse that pollution of the water supply was not a serious problem. After community life developed and agricultural villages became urban centres, the problem of supplying water became important for inhabitants of a city, as well as for irrigation of the farms surrounding the city. Irrigation works were known in prehistoric times, and before 2000 BC the rulers of Babylonia and Egypt constructed systems of dams and canals to impound the flood waters of the Euphrates and Nile rivers, controlling floods and providing irrigation water throughout the dry season. Such irrigation canals also supplied water for domestic purposes. The first people to consider the sanitation of their water supply were the ancient Romans, who constructed a vast system of aqueducts to bring the clean waters of the Apennine Mountains into the city and built basins and filters along these mains to ensure the clarity of the water. The construction of such extensive water-supply systems declined when the Roman Empire disintegrated, and for several centuries local springs and wells formed the main source of domestic and industrial water.The invention of the force pump in England in the middle of the 16th century greatly extended the possibilities of development of water-supply systems. In London, the first pumping waterworks was completed in 1562; it pumped river water to a reservoir about 37 m above the level of the River Thames and from the reservoir the water was distributed by gravity, through lead pipes, to buildings in the vicinity.Increased per-capita demand has coincided with water shortages in many countries. Southeast England, for example, receives only 14 per cent of Britain's rainfall, has 30 per cent of its population, and has experienced declining winter rainfall since the 1980s.In recent years a great deal of interest has been shown in the conversion of seawater to fresh water to provide drinking water for very dry areas, such as the Middle East. Several different processes, including distillation, electrodialysis, reverse osmosis, and direct-freeze evaporation, have been developed for this purpose. Some of these processes have been used in large facilities in the United States. Although these processes are successful, the cost of treating seawater is much higher than that for treating fresh waterEarly peoples didn’t need water supply engineering works because ______

Xem chi tiết 1.2 K lượt xem 6 năm trước

Read the passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.My younger sister is a potential star of state and screen, or at least that's what she tells me. Last week she had an interview. It was for the (38)……………..of Juliet in Shakespear’s Romeo and Juliet. It went well and she starts (39)……………..next week. This is the first play that she has been in, but she has done quite a lot of TV advertising work and she has been in a couple of films. The last film she was in was called The magician. It was set in ancient Egypt and she was in a crowd (40)……………..with thousands of other people. When I went to see it, I sat in the front (41)……………..so that I could see the (42)…………….. really clearly, but I couldn’t pick out my sister in the crowd. She says the (43)……………..was one of the best professionals she has worked with but I must say the (44)……………..seemed a bit stupid to me. It was all about a very clever magician who had managed to travel back through time to the Court of Tutankhamen. The (45)……………..were magnificent and so were some of the sets but having an actor saying (46)……………..in present day American English just didn’t work. The ending was really ridiculous. The magician got accidentally buried with Tutankhamen. Funnily enough, the rest of the (47)……………..seemed to have rather enjoyed the film.Question 47

Xem chi tiết 561 lượt xem 6 năm trước

Read the passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.My younger sister is a potential star of state and screen, or at least that's what she tells me. Last week she had an interview. It was for the (38)……………..of Juliet in Shakespear’s Romeo and Juliet. It went well and she starts (39)……………..next week. This is the first play that she has been in, but she has done quite a lot of TV advertising work and she has been in a couple of films. The last film she was in was called The magician. It was set in ancient Egypt and she was in a crowd (40)……………..with thousands of other people. When I went to see it, I sat in the front (41)……………..so that I could see the (42)…………….. really clearly, but I couldn’t pick out my sister in the crowd. She says the (43)……………..was one of the best professionals she has worked with but I must say the (44)……………..seemed a bit stupid to me. It was all about a very clever magician who had managed to travel back through time to the Court of Tutankhamen. The (45)……………..were magnificent and so were some of the sets but having an actor saying (46)……………..in present day American English just didn’t work. The ending was really ridiculous. The magician got accidentally buried with Tutankhamen. Funnily enough, the rest of the (47)……………..seemed to have rather enjoyed the film.Question 46

Xem chi tiết 2.2 K lượt xem 6 năm trước

Read the passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.My younger sister is a potential star of state and screen, or at least that's what she tells me. Last week she had an interview. It was for the (38)……………..of Juliet in Shakespear’s Romeo and Juliet. It went well and she starts (39)……………..next week. This is the first play that she has been in, but she has done quite a lot of TV advertising work and she has been in a couple of films. The last film she was in was called The magician. It was set in ancient Egypt and she was in a crowd (40)……………..with thousands of other people. When I went to see it, I sat in the front (41)……………..so that I could see the (42)…………….. really clearly, but I couldn’t pick out my sister in the crowd. She says the (43)……………..was one of the best professionals she has worked with but I must say the (44)……………..seemed a bit stupid to me. It was all about a very clever magician who had managed to travel back through time to the Court of Tutankhamen. The (45)……………..were magnificent and so were some of the sets but having an actor saying (46)……………..in present day American English just didn’t work. The ending was really ridiculous. The magician got accidentally buried with Tutankhamen. Funnily enough, the rest of the (47)……………..seemed to have rather enjoyed the film.Question 45

Xem chi tiết 268 lượt xem 6 năm trước

Read the passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.My younger sister is a potential star of state and screen, or at least that's what she tells me. Last week she had an interview. It was for the (38)……………..of Juliet in Shakespear’s Romeo and Juliet. It went well and she starts (39)……………..next week. This is the first play that she has been in, but she has done quite a lot of TV advertising work and she has been in a couple of films. The last film she was in was called The magician. It was set in ancient Egypt and she was in a crowd (40)……………..with thousands of other people. When I went to see it, I sat in the front (41)……………..so that I could see the (42)…………….. really clearly, but I couldn’t pick out my sister in the crowd. She says the (43)……………..was one of the best professionals she has worked with but I must say the (44)……………..seemed a bit stupid to me. It was all about a very clever magician who had managed to travel back through time to the Court of Tutankhamen. The (45)……………..were magnificent and so were some of the sets but having an actor saying (46)……………..in present day American English just didn’t work. The ending was really ridiculous. The magician got accidentally buried with Tutankhamen. Funnily enough, the rest of the (47)……………..seemed to have rather enjoyed the film.Question 44

Xem chi tiết 375 lượt xem 6 năm trước

Read the passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.My younger sister is a potential star of state and screen, or at least that's what she tells me. Last week she had an interview. It was for the (38)……………..of Juliet in Shakespear’s Romeo and Juliet. It went well and she starts (39)……………..next week. This is the first play that she has been in, but she has done quite a lot of TV advertising work and she has been in a couple of films. The last film she was in was called The magician. It was set in ancient Egypt and she was in a crowd (40)……………..with thousands of other people. When I went to see it, I sat in the front (41)……………..so that I could see the (42)…………….. really clearly, but I couldn’t pick out my sister in the crowd. She says the (43)……………..was one of the best professionals she has worked with but I must say the (44)……………..seemed a bit stupid to me. It was all about a very clever magician who had managed to travel back through time to the Court of Tutankhamen. The (45)……………..were magnificent and so were some of the sets but having an actor saying (46)……………..in present day American English just didn’t work. The ending was really ridiculous. The magician got accidentally buried with Tutankhamen. Funnily enough, the rest of the (47)……………..seemed to have rather enjoyed the film.Question 43

Xem chi tiết 331 lượt xem 6 năm trước

Read the passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.My younger sister is a potential star of state and screen, or at least that's what she tells me. Last week she had an interview. It was for the (38)……………..of Juliet in Shakespear’s Romeo and Juliet. It went well and she starts (39)……………..next week. This is the first play that she has been in, but she has done quite a lot of TV advertising work and she has been in a couple of films. The last film she was in was called The magician. It was set in ancient Egypt and she was in a crowd (40)……………..with thousands of other people. When I went to see it, I sat in the front (41)……………..so that I could see the (42)…………….. really clearly, but I couldn’t pick out my sister in the crowd. She says the (43)……………..was one of the best professionals she has worked with but I must say the (44)……………..seemed a bit stupid to me. It was all about a very clever magician who had managed to travel back through time to the Court of Tutankhamen. The (45)……………..were magnificent and so were some of the sets but having an actor saying (46)……………..in present day American English just didn’t work. The ending was really ridiculous. The magician got accidentally buried with Tutankhamen. Funnily enough, the rest of the (47)……………..seemed to have rather enjoyed the film.Question 42

Xem chi tiết 642 lượt xem 6 năm trước

Read the passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.My younger sister is a potential star of state and screen, or at least that's what she tells me. Last week she had an interview. It was for the (38)……………..of Juliet in Shakespear’s Romeo and Juliet. It went well and she starts (39)……………..next week. This is the first play that she has been in, but she has done quite a lot of TV advertising work and she has been in a couple of films. The last film she was in was called The magician. It was set in ancient Egypt and she was in a crowd (40)……………..with thousands of other people. When I went to see it, I sat in the front (41)……………..so that I could see the (42)…………….. really clearly, but I couldn’t pick out my sister in the crowd. She says the (43)……………..was one of the best professionals she has worked with but I must say the (44)……………..seemed a bit stupid to me. It was all about a very clever magician who had managed to travel back through time to the Court of Tutankhamen. The (45)……………..were magnificent and so were some of the sets but having an actor saying (46)……………..in present day American English just didn’t work. The ending was really ridiculous. The magician got accidentally buried with Tutankhamen. Funnily enough, the rest of the (47)……………..seemed to have rather enjoyed the film.Question 41

Xem chi tiết 284 lượt xem 6 năm trước

Read the passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.My younger sister is a potential star of state and screen, or at least that's what she tells me. Last week she had an interview. It was for the (38)……………..of Juliet in Shakespear’s Romeo and Juliet. It went well and she starts (39)……………..next week. This is the first play that she has been in, but she has done quite a lot of TV advertising work and she has been in a couple of films. The last film she was in was called The magician. It was set in ancient Egypt and she was in a crowd (40)……………..with thousands of other people. When I went to see it, I sat in the front (41)……………..so that I could see the (42)…………….. really clearly, but I couldn’t pick out my sister in the crowd. She says the (43)……………..was one of the best professionals she has worked with but I must say the (44)……………..seemed a bit stupid to me. It was all about a very clever magician who had managed to travel back through time to the Court of Tutankhamen. The (45)……………..were magnificent and so were some of the sets but having an actor saying (46)……………..in present day American English just didn’t work. The ending was really ridiculous. The magician got accidentally buried with Tutankhamen. Funnily enough, the rest of the (47)……………..seemed to have rather enjoyed the film.Question 40

Xem chi tiết 387 lượt xem 6 năm trước

Read the passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.My younger sister is a potential star of state and screen, or at least that's what she tells me. Last week she had an interview. It was for the (38)……………..of Juliet in Shakespear’s Romeo and Juliet. It went well and she starts (39)……………..next week. This is the first play that she has been in, but she has done quite a lot of TV advertising work and she has been in a couple of films. The last film she was in was called The magician. It was set in ancient Egypt and she was in a crowd (40)……………..with thousands of other people. When I went to see it, I sat in the front (41)……………..so that I could see the (42)…………….. really clearly, but I couldn’t pick out my sister in the crowd. She says the (43)……………..was one of the best professionals she has worked with but I must say the (44)……………..seemed a bit stupid to me. It was all about a very clever magician who had managed to travel back through time to the Court of Tutankhamen. The (45)……………..were magnificent and so were some of the sets but having an actor saying (46)……………..in present day American English just didn’t work. The ending was really ridiculous. The magician got accidentally buried with Tutankhamen. Funnily enough, the rest of the (47)……………..seemed to have rather enjoyed the film.Question 39

Xem chi tiết 414 lượt xem 6 năm trước

Read the passage and mark A, B, C, or D to indicate the correct answer to each of the blanks.My younger sister is a potential star of state and screen, or at least that's what she tells me. Last week she had an interview. It was for the (38)……………..of Juliet in Shakespear’s Romeo and Juliet. It went well and she starts (39)……………..next week. This is the first play that she has been in, but she has done quite a lot of TV advertising work and she has been in a couple of films. The last film she was in was called The magician. It was set in ancient Egypt and she was in a crowd (40)……………..with thousands of other people. When I went to see it, I sat in the front (41)……………..so that I could see the (42)…………….. really clearly, but I couldn’t pick out my sister in the crowd. She says the (43)……………..was one of the best professionals she has worked with but I must say the (44)……………..seemed a bit stupid to me. It was all about a very clever magician who had managed to travel back through time to the Court of Tutankhamen. The (45)……………..were magnificent and so were some of the sets but having an actor saying (46)……………..in present day American English just didn’t work. The ending was really ridiculous. The magician got accidentally buried with Tutankhamen. Funnily enough, the rest of the (47)……………..seemed to have rather enjoyed the film.Question 38

Xem chi tiết 459 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.ACADEMICS AREN’T THE PROBLEMStudies about how students use their time might shed light on whether they face increased academic and financial pressures compared with earlier eras.Based on data about how students are spending time, academic or financial pressures don’t seem to be greater now than a generation ago.The data show that full-time students in all types of colleges study much less now than they did a generation ago - a full 10 hours a week less. Students are also receiving significantly higher grades. So it appears that academic pressures are, in fact, considerably lower than they used to be.The time-use data don’t suggest that students feel greater financial pressures, either. When the time savings and lower opportunity costs are factored in, college appears less expensive for most students than it was in the 1960s. And though there are now full-time students working to pay while in college, they study less even when paid work choices are held constantly.In other words, full-time students do not appear to be studying less in order to work more. They appear to be studying less and spending the extra time on leisure activities or fun. It seems hard to imagine that students feeling increased financial pressures would respond by taking more leisure.Based on how students are spending their time then, it doesn’t look as though academic or financial pressures are greater now than a generation ago. The time-use data don’t speak directly to social pressures, and it may well be that these have become more intense lately.In one recent set of data, students reported spending more than 23 hours per week either socializing with friends or playing on the computer for fun. Social activities, in person or on computer, would seem to have become the major focus of campus life. It is hard to tell what kinds of pressures would be associated with this changeThe word “Academics” in the title mostly means___________

Xem chi tiết 603 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.ACADEMICS AREN’T THE PROBLEMStudies about how students use their time might shed light on whether they face increased academic and financial pressures compared with earlier eras.Based on data about how students are spending time, academic or financial pressures don’t seem to be greater now than a generation ago.The data show that full-time students in all types of colleges study much less now than they did a generation ago - a full 10 hours a week less. Students are also receiving significantly higher grades. So it appears that academic pressures are, in fact, considerably lower than they used to be.The time-use data don’t suggest that students feel greater financial pressures, either. When the time savings and lower opportunity costs are factored in, college appears less expensive for most students than it was in the 1960s. And though there are now full-time students working to pay while in college, they study less even when paid work choices are held constantly.In other words, full-time students do not appear to be studying less in order to work more. They appear to be studying less and spending the extra time on leisure activities or fun. It seems hard to imagine that students feeling increased financial pressures would respond by taking more leisure.Based on how students are spending their time then, it doesn’t look as though academic or financial pressures are greater now than a generation ago. The time-use data don’t speak directly to social pressures, and it may well be that these have become more intense lately.In one recent set of data, students reported spending more than 23 hours per week either socializing with friends or playing on the computer for fun. Social activities, in person or on computer, would seem to have become the major focus of campus life. It is hard to tell what kinds of pressures would be associated with this changeThe author finds it hard to point out___________

Xem chi tiết 554 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.ACADEMICS AREN’T THE PROBLEMStudies about how students use their time might shed light on whether they face increased academic and financial pressures compared with earlier eras.Based on data about how students are spending time, academic or financial pressures don’t seem to be greater now than a generation ago.The data show that full-time students in all types of colleges study much less now than they did a generation ago - a full 10 hours a week less. Students are also receiving significantly higher grades. So it appears that academic pressures are, in fact, considerably lower than they used to be.The time-use data don’t suggest that students feel greater financial pressures, either. When the time savings and lower opportunity costs are factored in, college appears less expensive for most students than it was in the 1960s. And though there are now full-time students working to pay while in college, they study less even when paid work choices are held constantly.In other words, full-time students do not appear to be studying less in order to work more. They appear to be studying less and spending the extra time on leisure activities or fun. It seems hard to imagine that students feeling increased financial pressures would respond by taking more leisure.Based on how students are spending their time then, it doesn’t look as though academic or financial pressures are greater now than a generation ago. The time-use data don’t speak directly to social pressures, and it may well be that these have become more intense lately.In one recent set of data, students reported spending more than 23 hours per week either socializing with friends or playing on the computer for fun. Social activities, in person or on computer, would seem to have become the major focus of campus life. It is hard to tell what kinds of pressures would be associated with this changeThe word “focus” in the last paragraph can be replaced with__________

Xem chi tiết 674 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.ACADEMICS AREN’T THE PROBLEMStudies about how students use their time might shed light on whether they face increased academic and financial pressures compared with earlier eras.Based on data about how students are spending time, academic or financial pressures don’t seem to be greater now than a generation ago.The data show that full-time students in all types of colleges study much less now than they did a generation ago - a full 10 hours a week less. Students are also receiving significantly higher grades. So it appears that academic pressures are, in fact, considerably lower than they used to be.The time-use data don’t suggest that students feel greater financial pressures, either. When the time savings and lower opportunity costs are factored in, college appears less expensive for most students than it was in the 1960s. And though there are now full-time students working to pay while in college, they study less even when paid work choices are held constantly.In other words, full-time students do not appear to be studying less in order to work more. They appear to be studying less and spending the extra time on leisure activities or fun. It seems hard to imagine that students feeling increased financial pressures would respond by taking more leisure.Based on how students are spending their time then, it doesn’t look as though academic or financial pressures are greater now than a generation ago. The time-use data don’t speak directly to social pressures, and it may well be that these have become more intense lately.In one recent set of data, students reported spending more than 23 hours per week either socializing with friends or playing on the computer for fun. Social activities, in person or on computer, would seem to have become the major focus of campus life. It is hard to tell what kinds of pressures would be associated with this changeStudents nowadays seem to be studying less and__________

Xem chi tiết 1.6 K lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.ACADEMICS AREN’T THE PROBLEMStudies about how students use their time might shed light on whether they face increased academic and financial pressures compared with earlier eras.Based on data about how students are spending time, academic or financial pressures don’t seem to be greater now than a generation ago.The data show that full-time students in all types of colleges study much less now than they did a generation ago - a full 10 hours a week less. Students are also receiving significantly higher grades. So it appears that academic pressures are, in fact, considerably lower than they used to be.The time-use data don’t suggest that students feel greater financial pressures, either. When the time savings and lower opportunity costs are factored in, college appears less expensive for most students than it was in the 1960s. And though there are now full-time students working to pay while in college, they study less even when paid work choices are held constantly.In other words, full-time students do not appear to be studying less in order to work more. They appear to be studying less and spending the extra time on leisure activities or fun. It seems hard to imagine that students feeling increased financial pressures would respond by taking more leisure.Based on how students are spending their time then, it doesn’t look as though academic or financial pressures are greater now than a generation ago. The time-use data don’t speak directly to social pressures, and it may well be that these have become more intense lately.In one recent set of data, students reported spending more than 23 hours per week either socializing with friends or playing on the computer for fun. Social activities, in person or on computer, would seem to have become the major focus of campus life. It is hard to tell what kinds of pressures would be associated with this changeAccording to the author, the fact that more full-time students are working for pay________

Xem chi tiết 1 K lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.ACADEMICS AREN’T THE PROBLEMStudies about how students use their time might shed light on whether they face increased academic and financial pressures compared with earlier eras.Based on data about how students are spending time, academic or financial pressures don’t seem to be greater now than a generation ago.The data show that full-time students in all types of colleges study much less now than they did a generation ago - a full 10 hours a week less. Students are also receiving significantly higher grades. So it appears that academic pressures are, in fact, considerably lower than they used to be.The time-use data don’t suggest that students feel greater financial pressures, either. When the time savings and lower opportunity costs are factored in, college appears less expensive for most students than it was in the 1960s. And though there are now full-time students working to pay while in college, they study less even when paid work choices are held constantly.In other words, full-time students do not appear to be studying less in order to work more. They appear to be studying less and spending the extra time on leisure activities or fun. It seems hard to imagine that students feeling increased financial pressures would respond by taking more leisure.Based on how students are spending their time then, it doesn’t look as though academic or financial pressures are greater now than a generation ago. The time-use data don’t speak directly to social pressures, and it may well be that these have become more intense lately.In one recent set of data, students reported spending more than 23 hours per week either socializing with friends or playing on the computer for fun. Social activities, in person or on computer, would seem to have become the major focus of campus life. It is hard to tell what kinds of pressures would be associated with this changeAll factors considered, college now seems___________

Xem chi tiết 363 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.ACADEMICS AREN’T THE PROBLEMStudies about how students use their time might shed light on whether they face increased academic and financial pressures compared with earlier eras.Based on data about how students are spending time, academic or financial pressures don’t seem to be greater now than a generation ago.The data show that full-time students in all types of colleges study much less now than they did a generation ago - a full 10 hours a week less. Students are also receiving significantly higher grades. So it appears that academic pressures are, in fact, considerably lower than they used to be.The time-use data don’t suggest that students feel greater financial pressures, either. When the time savings and lower opportunity costs are factored in, college appears less expensive for most students than it was in the 1960s. And though there are now full-time students working to pay while in college, they study less even when paid work choices are held constantly.In other words, full-time students do not appear to be studying less in order to work more. They appear to be studying less and spending the extra time on leisure activities or fun. It seems hard to imagine that students feeling increased financial pressures would respond by taking more leisure.Based on how students are spending their time then, it doesn’t look as though academic or financial pressures are greater now than a generation ago. The time-use data don’t speak directly to social pressures, and it may well be that these have become more intense lately.In one recent set of data, students reported spending more than 23 hours per week either socializing with friends or playing on the computer for fun. Social activities, in person or on computer, would seem to have become the major focus of campus life. It is hard to tell what kinds of pressures would be associated with this changeAccording to the author, the fact that students have more time for leisure is a proof that_____

Xem chi tiết 510 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.ACADEMICS AREN’T THE PROBLEMStudies about how students use their time might shed light on whether they face increased academic and financial pressures compared with earlier eras.Based on data about how students are spending time, academic or financial pressures don’t seem to be greater now than a generation ago.The data show that full-time students in all types of colleges study much less now than they did a generation ago - a full 10 hours a week less. Students are also receiving significantly higher grades. So it appears that academic pressures are, in fact, considerably lower than they used to be.The time-use data don’t suggest that students feel greater financial pressures, either. When the time savings and lower opportunity costs are factored in, college appears less expensive for most students than it was in the 1960s. And though there are now full-time students working to pay while in college, they study less even when paid work choices are held constantly.In other words, full-time students do not appear to be studying less in order to work more. They appear to be studying less and spending the extra time on leisure activities or fun. It seems hard to imagine that students feeling increased financial pressures would respond by taking more leisure.Based on how students are spending their time then, it doesn’t look as though academic or financial pressures are greater now than a generation ago. The time-use data don’t speak directly to social pressures, and it may well be that these have become more intense lately.In one recent set of data, students reported spending more than 23 hours per week either socializing with friends or playing on the computer for fun. Social activities, in person or on computer, would seem to have become the major focus of campus life. It is hard to tell what kinds of pressures would be associated with this changeStudents get higher grades as__________

Xem chi tiết 1 K lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.ACADEMICS AREN’T THE PROBLEMStudies about how students use their time might shed light on whether they face increased academic and financial pressures compared with earlier eras.Based on data about how students are spending time, academic or financial pressures don’t seem to be greater now than a generation ago.The data show that full-time students in all types of colleges study much less now than they did a generation ago - a full 10 hours a week less. Students are also receiving significantly higher grades. So it appears that academic pressures are, in fact, considerably lower than they used to be.The time-use data don’t suggest that students feel greater financial pressures, either. When the time savings and lower opportunity costs are factored in, college appears less expensive for most students than it was in the 1960s. And though there are now full-time students working to pay while in college, they study less even when paid work choices are held constantly.In other words, full-time students do not appear to be studying less in order to work more. They appear to be studying less and spending the extra time on leisure activities or fun. It seems hard to imagine that students feeling increased financial pressures would respond by taking more leisure.Based on how students are spending their time then, it doesn’t look as though academic or financial pressures are greater now than a generation ago. The time-use data don’t speak directly to social pressures, and it may well be that these have become more intense lately.In one recent set of data, students reported spending more than 23 hours per week either socializing with friends or playing on the computer for fun. Social activities, in person or on computer, would seem to have become the major focus of campus life. It is hard to tell what kinds of pressures would be associated with this changeResearch studies have shown that pressures put on students nowadays are __________

Xem chi tiết 1.1 K lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.ACADEMICS AREN’T THE PROBLEMStudies about how students use their time might shed light on whether they face increased academic and financial pressures compared with earlier eras.Based on data about how students are spending time, academic or financial pressures don’t seem to be greater now than a generation ago.The data show that full-time students in all types of colleges study much less now than they did a generation ago - a full 10 hours a week less. Students are also receiving significantly higher grades. So it appears that academic pressures are, in fact, considerably lower than they used to be.The time-use data don’t suggest that students feel greater financial pressures, either. When the time savings and lower opportunity costs are factored in, college appears less expensive for most students than it was in the 1960s. And though there are now full-time students working to pay while in college, they study less even when paid work choices are held constantly.In other words, full-time students do not appear to be studying less in order to work more. They appear to be studying less and spending the extra time on leisure activities or fun. It seems hard to imagine that students feeling increased financial pressures would respond by taking more leisure.Based on how students are spending their time then, it doesn’t look as though academic or financial pressures are greater now than a generation ago. The time-use data don’t speak directly to social pressures, and it may well be that these have become more intense lately.In one recent set of data, students reported spending more than 23 hours per week either socializing with friends or playing on the computer for fun. Social activities, in person or on computer, would seem to have become the major focus of campus life. It is hard to tell what kinds of pressures would be associated with this changeThe study’s conclusion that students’ workload now is not greater than before is based on_________

Xem chi tiết 1.1 K lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Plants and animals will find it difficult to escape from or adjust to the effect of global warming. Scientists have already observed shifts in the lifecycles of many plants and animals, such as flowers blooming earlier and birds hatching earlier in the spring. Many species have begun shifting where they live or their annual migration patterns due to warmer temperatures. With further warming, animals will tend to migrate toward the poles and up mountainsides toward higher elevations. Plants will also attempt to shift their ranges, seeking new areas as old habitats grow too warm. In many places, however, human development will prevent these shifts. Species that find cities or farmland blocking their way north or south may become extinct. Species living in unique ecosystems, such as those found in polar and mountaintop regions, are especially at risk because migration to new habitats is not possible. For instance, polar bears and marine mammals in the Arctic are already threatened by dwindling sea ice but have nowhere farther to go. Projecting species extinction due to global warming is extremely difficult. Some scientists have estimated that 20 to 50 percent of species could be committed to extinction with 2 to 3 Celsius degrees of further warming. The rate of warming, not just the magnitude, is extremely important for plants and animals. Some species and even entire ecosystems, such as certain types of forest, many not be able to adjust quickly enough and may disappear. Ocean ecosystems, especially fragile ones like coral reefs, will also be affected by global warming. Warmer ocean temperatures can cause coral to “bleach”, a state which if prolonged will lead to the death of the coral. Scientists estimate that even 1 Celsius degree of additional warming could lead to widespread bleaching and death of coral reefs around the world. Also, increasing carbon dioxide in the atmosphere enters the ocean and increases the acidity of ocean waters. This acidification further stresses ocean ecosystems.From “global warming” by Michael Mastrandrea and Stephen H.SchneiderWhat does the passage mainly discuss?

Xem chi tiết 601 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Plants and animals will find it difficult to escape from or adjust to the effect of global warming. Scientists have already observed shifts in the lifecycles of many plants and animals, such as flowers blooming earlier and birds hatching earlier in the spring. Many species have begun shifting where they live or their annual migration patterns due to warmer temperatures. With further warming, animals will tend to migrate toward the poles and up mountainsides toward higher elevations. Plants will also attempt to shift their ranges, seeking new areas as old habitats grow too warm. In many places, however, human development will prevent these shifts. Species that find cities or farmland blocking their way north or south may become extinct. Species living in unique ecosystems, such as those found in polar and mountaintop regions, are especially at risk because migration to new habitats is not possible. For instance, polar bears and marine mammals in the Arctic are already threatened by dwindling sea ice but have nowhere farther to go. Projecting species extinction due to global warming is extremely difficult. Some scientists have estimated that 20 to 50 percent of species could be committed to extinction with 2 to 3 Celsius degrees of further warming. The rate of warming, not just the magnitude, is extremely important for plants and animals. Some species and even entire ecosystems, such as certain types of forest, many not be able to adjust quickly enough and may disappear. Ocean ecosystems, especially fragile ones like coral reefs, will also be affected by global warming. Warmer ocean temperatures can cause coral to “bleach”, a state which if prolonged will lead to the death of the coral. Scientists estimate that even 1 Celsius degree of additional warming could lead to widespread bleaching and death of coral reefs around the world. Also, increasing carbon dioxide in the atmosphere enters the ocean and increases the acidity of ocean waters. This acidification further stresses ocean ecosystems.From “global warming” by Michael Mastrandrea and Stephen H.SchneiderThe level of acidity in the ocean is increased by ________.

Xem chi tiết 655 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Plants and animals will find it difficult to escape from or adjust to the effect of global warming. Scientists have already observed shifts in the lifecycles of many plants and animals, such as flowers blooming earlier and birds hatching earlier in the spring. Many species have begun shifting where they live or their annual migration patterns due to warmer temperatures. With further warming, animals will tend to migrate toward the poles and up mountainsides toward higher elevations. Plants will also attempt to shift their ranges, seeking new areas as old habitats grow too warm. In many places, however, human development will prevent these shifts. Species that find cities or farmland blocking their way north or south may become extinct. Species living in unique ecosystems, such as those found in polar and mountaintop regions, are especially at risk because migration to new habitats is not possible. For instance, polar bears and marine mammals in the Arctic are already threatened by dwindling sea ice but have nowhere farther to go. Projecting species extinction due to global warming is extremely difficult. Some scientists have estimated that 20 to 50 percent of species could be committed to extinction with 2 to 3 Celsius degrees of further warming. The rate of warming, not just the magnitude, is extremely important for plants and animals. Some species and even entire ecosystems, such as certain types of forest, many not be able to adjust quickly enough and may disappear. Ocean ecosystems, especially fragile ones like coral reefs, will also be affected by global warming. Warmer ocean temperatures can cause coral to “bleach”, a state which if prolonged will lead to the death of the coral. Scientists estimate that even 1 Celsius degree of additional warming could lead to widespread bleaching and death of coral reefs around the world. Also, increasing carbon dioxide in the atmosphere enters the ocean and increases the acidity of ocean waters. This acidification further stresses ocean ecosystems.From “global warming” by Michael Mastrandrea and Stephen H.SchneiderThe bleaching of coral reefs as mentioned in paragraph 4 indicates ________.

Xem chi tiết 572 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Plants and animals will find it difficult to escape from or adjust to the effect of global warming. Scientists have already observed shifts in the lifecycles of many plants and animals, such as flowers blooming earlier and birds hatching earlier in the spring. Many species have begun shifting where they live or their annual migration patterns due to warmer temperatures. With further warming, animals will tend to migrate toward the poles and up mountainsides toward higher elevations. Plants will also attempt to shift their ranges, seeking new areas as old habitats grow too warm. In many places, however, human development will prevent these shifts. Species that find cities or farmland blocking their way north or south may become extinct. Species living in unique ecosystems, such as those found in polar and mountaintop regions, are especially at risk because migration to new habitats is not possible. For instance, polar bears and marine mammals in the Arctic are already threatened by dwindling sea ice but have nowhere farther to go. Projecting species extinction due to global warming is extremely difficult. Some scientists have estimated that 20 to 50 percent of species could be committed to extinction with 2 to 3 Celsius degrees of further warming. The rate of warming, not just the magnitude, is extremely important for plants and animals. Some species and even entire ecosystems, such as certain types of forest, many not be able to adjust quickly enough and may disappear. Ocean ecosystems, especially fragile ones like coral reefs, will also be affected by global warming. Warmer ocean temperatures can cause coral to “bleach”, a state which if prolonged will lead to the death of the coral. Scientists estimate that even 1 Celsius degree of additional warming could lead to widespread bleaching and death of coral reefs around the world. Also, increasing carbon dioxide in the atmosphere enters the ocean and increases the acidity of ocean waters. This acidification further stresses ocean ecosystems.From “global warming” by Michael Mastrandrea and Stephen H.SchneiderThe word “fragile” in paragragh 4 most probably means_______.

Xem chi tiết 372 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Plants and animals will find it difficult to escape from or adjust to the effect of global warming. Scientists have already observed shifts in the lifecycles of many plants and animals, such as flowers blooming earlier and birds hatching earlier in the spring. Many species have begun shifting where they live or their annual migration patterns due to warmer temperatures. With further warming, animals will tend to migrate toward the poles and up mountainsides toward higher elevations. Plants will also attempt to shift their ranges, seeking new areas as old habitats grow too warm. In many places, however, human development will prevent these shifts. Species that find cities or farmland blocking their way north or south may become extinct. Species living in unique ecosystems, such as those found in polar and mountaintop regions, are especially at risk because migration to new habitats is not possible. For instance, polar bears and marine mammals in the Arctic are already threatened by dwindling sea ice but have nowhere farther to go. Projecting species extinction due to global warming is extremely difficult. Some scientists have estimated that 20 to 50 percent of species could be committed to extinction with 2 to 3 Celsius degrees of further warming. The rate of warming, not just the magnitude, is extremely important for plants and animals. Some species and even entire ecosystems, such as certain types of forest, many not be able to adjust quickly enough and may disappear. Ocean ecosystems, especially fragile ones like coral reefs, will also be affected by global warming. Warmer ocean temperatures can cause coral to “bleach”, a state which if prolonged will lead to the death of the coral. Scientists estimate that even 1 Celsius degree of additional warming could lead to widespread bleaching and death of coral reefs around the world. Also, increasing carbon dioxide in the atmosphere enters the ocean and increases the acidity of ocean waters. This acidification further stresses ocean ecosystems.From “global warming” by Michael Mastrandrea and Stephen H.SchneiderAccording to the passage, if some species are not able to adjust quickly to warmer temperatures, ________.

Xem chi tiết 717 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Plants and animals will find it difficult to escape from or adjust to the effect of global warming. Scientists have already observed shifts in the lifecycles of many plants and animals, such as flowers blooming earlier and birds hatching earlier in the spring. Many species have begun shifting where they live or their annual migration patterns due to warmer temperatures. With further warming, animals will tend to migrate toward the poles and up mountainsides toward higher elevations. Plants will also attempt to shift their ranges, seeking new areas as old habitats grow too warm. In many places, however, human development will prevent these shifts. Species that find cities or farmland blocking their way north or south may become extinct. Species living in unique ecosystems, such as those found in polar and mountaintop regions, are especially at risk because migration to new habitats is not possible. For instance, polar bears and marine mammals in the Arctic are already threatened by dwindling sea ice but have nowhere farther to go. Projecting species extinction due to global warming is extremely difficult. Some scientists have estimated that 20 to 50 percent of species could be committed to extinction with 2 to 3 Celsius degrees of further warming. The rate of warming, not just the magnitude, is extremely important for plants and animals. Some species and even entire ecosystems, such as certain types of forest, many not be able to adjust quickly enough and may disappear. Ocean ecosystems, especially fragile ones like coral reefs, will also be affected by global warming. Warmer ocean temperatures can cause coral to “bleach”, a state which if prolonged will lead to the death of the coral. Scientists estimate that even 1 Celsius degree of additional warming could lead to widespread bleaching and death of coral reefs around the world. Also, increasing carbon dioxide in the atmosphere enters the ocean and increases the acidity of ocean waters. This acidification further stresses ocean ecosystems.From “global warming” by Michael Mastrandrea and Stephen H.SchneiderIt is mentioned in the passage that if the global temperature rose by 2 or 3 Celsius degrees ________.

Xem chi tiết 567 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Plants and animals will find it difficult to escape from or adjust to the effect of global warming. Scientists have already observed shifts in the lifecycles of many plants and animals, such as flowers blooming earlier and birds hatching earlier in the spring. Many species have begun shifting where they live or their annual migration patterns due to warmer temperatures. With further warming, animals will tend to migrate toward the poles and up mountainsides toward higher elevations. Plants will also attempt to shift their ranges, seeking new areas as old habitats grow too warm. In many places, however, human development will prevent these shifts. Species that find cities or farmland blocking their way north or south may become extinct. Species living in unique ecosystems, such as those found in polar and mountaintop regions, are especially at risk because migration to new habitats is not possible. For instance, polar bears and marine mammals in the Arctic are already threatened by dwindling sea ice but have nowhere farther to go. Projecting species extinction due to global warming is extremely difficult. Some scientists have estimated that 20 to 50 percent of species could be committed to extinction with 2 to 3 Celsius degrees of further warming. The rate of warming, not just the magnitude, is extremely important for plants and animals. Some species and even entire ecosystems, such as certain types of forest, many not be able to adjust quickly enough and may disappear. Ocean ecosystems, especially fragile ones like coral reefs, will also be affected by global warming. Warmer ocean temperatures can cause coral to “bleach”, a state which if prolonged will lead to the death of the coral. Scientists estimate that even 1 Celsius degree of additional warming could lead to widespread bleaching and death of coral reefs around the world. Also, increasing carbon dioxide in the atmosphere enters the ocean and increases the acidity of ocean waters. This acidification further stresses ocean ecosystems.From “global warming” by Michael Mastrandrea and Stephen H.SchneiderThe phrase “dwindling sea ice” in paragraph 2 refers to _______.

Xem chi tiết 8.6 K lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Plants and animals will find it difficult to escape from or adjust to the effect of global warming. Scientists have already observed shifts in the lifecycles of many plants and animals, such as flowers blooming earlier and birds hatching earlier in the spring. Many species have begun shifting where they live or their annual migration patterns due to warmer temperatures. With further warming, animals will tend to migrate toward the poles and up mountainsides toward higher elevations. Plants will also attempt to shift their ranges, seeking new areas as old habitats grow too warm. In many places, however, human development will prevent these shifts. Species that find cities or farmland blocking their way north or south may become extinct. Species living in unique ecosystems, such as those found in polar and mountaintop regions, are especially at risk because migration to new habitats is not possible. For instance, polar bears and marine mammals in the Arctic are already threatened by dwindling sea ice but have nowhere farther to go. Projecting species extinction due to global warming is extremely difficult. Some scientists have estimated that 20 to 50 percent of species could be committed to extinction with 2 to 3 Celsius degrees of further warming. The rate of warming, not just the magnitude, is extremely important for plants and animals. Some species and even entire ecosystems, such as certain types of forest, many not be able to adjust quickly enough and may disappear. Ocean ecosystems, especially fragile ones like coral reefs, will also be affected by global warming. Warmer ocean temperatures can cause coral to “bleach”, a state which if prolonged will lead to the death of the coral. Scientists estimate that even 1 Celsius degree of additional warming could lead to widespread bleaching and death of coral reefs around the world. Also, increasing carbon dioxide in the atmosphere enters the ocean and increases the acidity of ocean waters. This acidification further stresses ocean ecosystems.From “global warming” by Michael Mastrandrea and Stephen H.SchneiderThe pronoun “those” in paragragh 2 refers to ________

Xem chi tiết 301 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Plants and animals will find it difficult to escape from or adjust to the effect of global warming. Scientists have already observed shifts in the lifecycles of many plants and animals, such as flowers blooming earlier and birds hatching earlier in the spring. Many species have begun shifting where they live or their annual migration patterns due to warmer temperatures. With further warming, animals will tend to migrate toward the poles and up mountainsides toward higher elevations. Plants will also attempt to shift their ranges, seeking new areas as old habitats grow too warm. In many places, however, human development will prevent these shifts. Species that find cities or farmland blocking their way north or south may become extinct. Species living in unique ecosystems, such as those found in polar and mountaintop regions, are especially at risk because migration to new habitats is not possible. For instance, polar bears and marine mammals in the Arctic are already threatened by dwindling sea ice but have nowhere farther to go. Projecting species extinction due to global warming is extremely difficult. Some scientists have estimated that 20 to 50 percent of species could be committed to extinction with 2 to 3 Celsius degrees of further warming. The rate of warming, not just the magnitude, is extremely important for plants and animals. Some species and even entire ecosystems, such as certain types of forest, many not be able to adjust quickly enough and may disappear. Ocean ecosystems, especially fragile ones like coral reefs, will also be affected by global warming. Warmer ocean temperatures can cause coral to “bleach”, a state which if prolonged will lead to the death of the coral. Scientists estimate that even 1 Celsius degree of additional warming could lead to widespread bleaching and death of coral reefs around the world. Also, increasing carbon dioxide in the atmosphere enters the ocean and increases the acidity of ocean waters. This acidification further stresses ocean ecosystems.From “global warming” by Michael Mastrandrea and Stephen H.SchneiderAccording to paragragh 2, when their habitats grow warmer, animals tend to move ________.

Xem chi tiết 407 lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Plants and animals will find it difficult to escape from or adjust to the effect of global warming. Scientists have already observed shifts in the lifecycles of many plants and animals, such as flowers blooming earlier and birds hatching earlier in the spring. Many species have begun shifting where they live or their annual migration patterns due to warmer temperatures. With further warming, animals will tend to migrate toward the poles and up mountainsides toward higher elevations. Plants will also attempt to shift their ranges, seeking new areas as old habitats grow too warm. In many places, however, human development will prevent these shifts. Species that find cities or farmland blocking their way north or south may become extinct. Species living in unique ecosystems, such as those found in polar and mountaintop regions, are especially at risk because migration to new habitats is not possible. For instance, polar bears and marine mammals in the Arctic are already threatened by dwindling sea ice but have nowhere farther to go. Projecting species extinction due to global warming is extremely difficult. Some scientists have estimated that 20 to 50 percent of species could be committed to extinction with 2 to 3 Celsius degrees of further warming. The rate of warming, not just the magnitude, is extremely important for plants and animals. Some species and even entire ecosystems, such as certain types of forest, many not be able to adjust quickly enough and may disappear. Ocean ecosystems, especially fragile ones like coral reefs, will also be affected by global warming. Warmer ocean temperatures can cause coral to “bleach”, a state which if prolonged will lead to the death of the coral. Scientists estimate that even 1 Celsius degree of additional warming could lead to widespread bleaching and death of coral reefs around the world. Also, increasing carbon dioxide in the atmosphere enters the ocean and increases the acidity of ocean waters. This acidification further stresses ocean ecosystems. From “global warming” by Michael Mastrandrea and Stephen H.SchneiderScientists have observed that warmer temperatures in the spring cause flowers to ________.

Xem chi tiết 4.2 K lượt xem 6 năm trước

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions from 31 to 35:Centuries ago, man discovered that removing moisture from food helped to preserve it, and that the easiest way to do this was to expose the food to sun and wind. In this way the North American Indians produced pemmican (dried meat ground into powder and made into cakes), the Scandinavians made stock fish and the Arabs dried dates and apricots.All foods contain water - cabbage and other leaf vegetables contain as much as 93% water, potatoes and other root vegetables 80%, lean meat 75% and fish anything from 80% to 60% depending on how fatty it is. If this water is removed, the activity of the bacteria which cause food to go bad is checked.Fruit is sun-dried in Asia Minor, Greece, Spain and other Mediterranean countries, and also in California, South Africa and Australia. The methods used vary, but in general the fruit is spread out on trays in drying yards in the hot sun. In order to prevent darkening, pears, peaches and apricots are exposed to the fumes of burning sulphur before drying. Plums for making prunes, and certain varieties of grapes for making raisins and currants, are dipped in an alkaline solution in order to crack the skins of the fruit slightly and remove their wax coating, so increasing the rate of drying.Nowadays most foods are dried mechanically; the conventional method of such dehydration is to put food in chambers through which hot air is blown at temperatures of about 110°C at entry to about 45°C at exit. This is the usual method for drying such things as vegetables, minced meat, and fish.Liquids such as milk, coffee, tea, soups and eggs may be dried by pouring them over a heated horizontal steel cylinder or by spraying them into a chamber through which a current of hot air passes. In the first case, the dried material is scraped off the roller as a thin film which is then broken up into small, though still relatively coarse flakes. In the second process it falls to the bottom of the chamber as a fine powder. Where recognizable pieces of meat and vegetables are required, as in soup, the ingredients are dried separately and then mixed.Dried foods take up less room and weigh less than the same food packed in cans or frozen, and they do not need to be stored in special conditions. For these reasons they are invaluable to climbers, explorers and soldiers in battle, who have little storage space. They are also popular with housewives because it takes so little time to cook them.This passage is mainly ________.

Xem chi tiết 503 lượt xem 6 năm trước