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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 from 35 to 42.For the last few years, my children have been going to a summer camp in northern Greece called Skouras Camp. They always seem to have a good time, so if you’ re wondering what to do with the kids for three weeks this summer, you could do worse than send them to this beautiful camp on the shores of the Aegean Sea. If your children, like mine, are keen on adventure, sports and good company, the Skouras Camp will keep them busy all day doing the things they most enjoy. Skouras is an international camp with children from all over the world. My children have made friends with children of their own age from Poland, China, Demark and the United States. Naturally, they get lots of opportunities to practise their English as this is the only language spoken. The camp is located in one of the most beautiful parts of Chalkidiki. It is huge (120.000 square meters) and is just a stone’s throw away from clear, blue Aegean Sea. It takes the children just five minutes to walk to the golden sandy beach on foot. The programme is packed with exciting activities such as horse riding and table tennis. Other sports in clude baseball, volleyball and athletics. The Camp ends with a sports contest in the last week which all parents are invited to attend.The word contest in the last sentence could be replaced by ___________.

Xem chi tiết 318 lượt xem 5 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 from 35 to 42.For the last few years, my children have been going to a summer camp in northern Greece called Skouras Camp. They always seem to have a good time, so if you’ re wondering what to do with the kids for three weeks this summer, you could do worse than send them to this beautiful camp on the shores of the Aegean Sea. If your children, like mine, are keen on adventure, sports and good company, the Skouras Camp will keep them busy all day doing the things they most enjoy. Skouras is an international camp with children from all over the world. My children have made friends with children of their own age from Poland, China, Demark and the United States. Naturally, they get lots of opportunities to practise their English as this is the only language spoken. The camp is located in one of the most beautiful parts of Chalkidiki. It is huge (120.000 square meters) and is just a stone’s throw away from clear, blue Aegean Sea. It takes the children just five minutes to walk to the golden sandy beach on foot. The programme is packed with exciting activities such as horse riding and table tennis. Other sports in clude baseball, volleyball and athletics. The Camp ends with a sports contest in the last week which all parents are invited to attend.Where is the camp located?

Xem chi tiết 224 lượt xem 5 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 from 35 to 42.For the last few years, my children have been going to a summer camp in northern Greece called Skouras Camp. They always seem to have a good time, so if you’ re wondering what to do with the kids for three weeks this summer, you could do worse than send them to this beautiful camp on the shores of the Aegean Sea. If your children, like mine, are keen on adventure, sports and good company, the Skouras Camp will keep them busy all day doing the things they most enjoy. Skouras is an international camp with children from all over the world. My children have made friends with children of their own age from Poland, China, Demark and the United States. Naturally, they get lots of opportunities to practise their English as this is the only language spoken. The camp is located in one of the most beautiful parts of Chalkidiki. It is huge (120.000 square meters) and is just a stone’s throw away from clear, blue Aegean Sea. It takes the children just five minutes to walk to the golden sandy beach on foot. The programme is packed with exciting activities such as horse riding and table tennis. Other sports in clude baseball, volleyball and athletics. The Camp ends with a sports contest in the last week which all parents are invited to attend.How long does it take the children to walk to the golden sandy beach on foot?

Xem chi tiết 323 lượt xem 5 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 from 35 to 42.For the last few years, my children have been going to a summer camp in northern Greece called Skouras Camp. They always seem to have a good time, so if you’ re wondering what to do with the kids for three weeks this summer, you could do worse than send them to this beautiful camp on the shores of the Aegean Sea. If your children, like mine, are keen on adventure, sports and good company, the Skouras Camp will keep them busy all day doing the things they most enjoy. Skouras is an international camp with children from all over the world. My children have made friends with children of their own age from Poland, China, Demark and the United States. Naturally, they get lots of opportunities to practise their English as this is the only language spoken. The camp is located in one of the most beautiful parts of Chalkidiki. It is huge (120.000 square meters) and is just a stone’s throw away from clear, blue Aegean Sea. It takes the children just five minutes to walk to the golden sandy beach on foot. The programme is packed with exciting activities such as horse riding and table tennis. Other sports in clude baseball, volleyball and athletics. The Camp ends with a sports contest in the last week which all parents are invited to attend.What should be the best title for the passage?

Xem chi tiết 1.4 K lượt xem 5 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 from 35 to 42.For the last few years, my children have been going to a summer camp in northern Greece called Skouras Camp. They always seem to have a good time, so if you’ re wondering what to do with the kids for three weeks this summer, you could do worse than send them to this beautiful camp on the shores of the Aegean Sea. If your children, like mine, are keen on adventure, sports and good company, the Skouras Camp will keep them busy all day doing the things they most enjoy. Skouras is an international camp with children from all over the world. My children have made friends with children of their own age from Poland, China, Demark and the United States. Naturally, they get lots of opportunities to practise their English as this is the only language spoken. The camp is located in one of the most beautiful parts of Chalkidiki. It is huge (120.000 square meters) and is just a stone’s throw away from clear, blue Aegean Sea. It takes the children just five minutes to walk to the golden sandy beach on foot. The programme is packed with exciting activities such as horse riding and table tennis. Other sports in clude baseball, volleyball and athletics. The Camp ends with a sports contest in the last week which all parents are invited to attend.The tone of the passage could best be described as __________.

Xem chi tiết 1 K lượt xem 5 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 from 35 to 42.For the last few years, my children have been going to a summer camp in northern Greece called Skouras Camp. They always seem to have a good time, so if you’ re wondering what to do with the kids for three weeks this summer, you could do worse than send them to this beautiful camp on the shores of the Aegean Sea. If your children, like mine, are keen on adventure, sports and good company, the Skouras Camp will keep them busy all day doing the things they most enjoy. Skouras is an international camp with children from all over the world. My children have made friends with children of their own age from Poland, China, Demark and the United States. Naturally, they get lots of opportunities to practise their English as this is the only language spoken. The camp is located in one of the most beautiful parts of Chalkidiki. It is huge (120.000 square meters) and is just a stone’s throw away from clear, blue Aegean Sea. It takes the children just five minutes to walk to the golden sandy beach on foot. The programme is packed with exciting activities such as horse riding and table tennis. Other sports in clude baseball, volleyball and athletics. The Camp ends with a sports contest in the last week which all parents are invited to attend.All the statements are true EXCEPT _________.

Xem chi tiết 528 lượt xem 5 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 from 35 to 42.For the last few years, my children have been going to a summer camp in northern Greece called Skouras Camp. They always seem to have a good time, so if you’ re wondering what to do with the kids for three weeks this summer, you could do worse than send them to this beautiful camp on the shores of the Aegean Sea. If your children, like mine, are keen on adventure, sports and good company, the Skouras Camp will keep them busy all day doing the things they most enjoy. Skouras is an international camp with children from all over the world. My children have made friends with children of their own age from Poland, China, Demark and the United States. Naturally, they get lots of opportunities to practise their English as this is the only language spoken. The camp is located in one of the most beautiful parts of Chalkidiki. It is huge (120.000 square meters) and is just a stone’s throw away from clear, blue Aegean Sea. It takes the children just five minutes to walk to the golden sandy beach on foot. The programme is packed with exciting activities such as horse riding and table tennis. Other sports in clude baseball, volleyball and athletics. The Camp ends with a sports contest in the last week which all parents are invited to attend.How many kinds of sports can be played in the Camp?

Xem chi tiết 587 lượt xem 5 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 from 35 to 42.For the last few years, my children have been going to a summer camp in northern Greece called Skouras Camp. They always seem to have a good time, so if you’ re wondering what to do with the kids for three weeks this summer, you could do worse than send them to this beautiful camp on the shores of the Aegean Sea. If your children, like mine, are keen on adventure, sports and good company, the Skouras Camp will keep them busy all day doing the things they most enjoy. Skouras is an international camp with children from all over the world. My children have made friends with children of their own age from Poland, China, Demark and the United States. Naturally, they get lots of opportunities to practise their English as this is the only language spoken. The camp is located in one of the most beautiful parts of Chalkidiki. It is huge (120.000 square meters) and is just a stone’s throw away from clear, blue Aegean Sea. It takes the children just five minutes to walk to the golden sandy beach on foot. The programme is packed with exciting activities such as horse riding and table tennis. Other sports in clude baseball, volleyball and athletics. The Camp ends with a sports contest in the last week which all parents are invited to attend.All the children come to the Camp have to __________.

Xem chi tiết 1.1 K lượt xem 5 năm trước

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.The economic depression in the late-nineteenth-century United States contributed significantly to a growing movement in literature toward realism and naturalism. After the 1870' s, a number of important authors began to reject the romanticism that had prevailed Line immediately following the Civil War of 1861-1865 and turned instead to realism.Determined to portray life as it was, with fldelity to real life and accurate representation without idealization, they studied local dialects, wrote stories which focused on life in speciflc regions of the country, and emphasized the "true" relationships between people. In doing so, they reflected broader trends in the society, such as industrialization, evolutionary theory which emphasized the effect of the environment on humans, and the influence of science.Realists such as Joel Chandler Harris and Ellen Glasgow depicted life in the South; Hamlin Garland described life on the Great Plains; and Sarah One Jewett wrote about everyday life in rural New England. Another realist, Bret Harte, achieved fame with stories that portrayed local life in the California mining camps. Samuel Clemens, who adopted the pen name Mark Twain, became the country's most outstanding realist author, observing life around him with a humorous and skeptical eye. In his stories and novels, Twain drew on his own experiences and used dialect and common speech instead of literary language, touching off a major change in American prose style.Other writers became impatient even with realism. Pushing evolutionary theory to its limits, they wrote of a world in which a cruel and merciless environment determined human fate. These writers, called naturalists, often focused on economic hardship, studying people struggling with poverty, and other aspects of urban and industrial life.Naturalists brought to their writing a passion for direct and honest experience. Theodore Dreiser, the foremost naturalist writer, in novels such as Sister Carrie, grimly portrayed a dark world in which human beings were tossed about by forces beyond their understanding or control. Dreiser thought that writers should tell the truth about human affairs, not fabricate romance, and Sister Carrie, he said, was "not intended as a piece of literary craftsmanship, but was a picture of conditions." Which of the following statements about Theodore Dreiser is supported by the passage?  

Xem chi tiết 663 lượt xem 5 năm trước

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.The economic depression in the late-nineteenth-century United States contributed significantly to a growing movement in literature toward realism and naturalism. After the 1870' s, a number of important authors began to reject the romanticism that had prevailed Line immediately following the Civil War of 1861-1865 and turned instead to realism.Determined to portray life as it was, with fldelity to real life and accurate representation without idealization, they studied local dialects, wrote stories which focused on life in speciflc regions of the country, and emphasized the "true" relationships between people. In doing so, they reflected broader trends in the society, such as industrialization, evolutionary theory which emphasized the effect of the environment on humans, and the influence of science.Realists such as Joel Chandler Harris and Ellen Glasgow depicted life in the South; Hamlin Garland described life on the Great Plains; and Sarah One Jewett wrote about everyday life in rural New England. Another realist, Bret Harte, achieved fame with stories that portrayed local life in the California mining camps. Samuel Clemens, who adopted the pen name Mark Twain, became the country's most outstanding realist author, observing life around him with a humorous and skeptical eye. In his stories and novels, Twain drew on his own experiences and used dialect and common speech instead of literary language, touching off a major change in American prose style.Other writers became impatient even with realism. Pushing evolutionary theory to its limits, they wrote of a world in which a cruel and merciless environment determined human fate. These writers, called naturalists, often focused on economic hardship, studying people struggling with poverty, and other aspects of urban and industrial life.Naturalists brought to their writing a passion for direct and honest experience. Theodore Dreiser, the foremost naturalist writer, in novels such as Sister Carrie, grimly portrayed a dark world in which human beings were tossed about by forces beyond their understanding or control. Dreiser thought that writers should tell the truth about human affairs, not fabricate romance, and Sister Carrie, he said, was "not intended as a piece of literary craftsmanship, but was a picture of conditions."Mark Twain is considered an important literary figure because he 

Xem chi tiết 844 lượt xem 5 năm trước

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.The economic depression in the late-nineteenth-century United States contributed significantly to a growing movement in literature toward realism and naturalism. After the 1870' s, a number of important authors began to reject the romanticism that had prevailed Line immediately following the Civil War of 1861-1865 and turned instead to realism.Determined to portray life as it was, with fldelity to real life and accurate representation without idealization, they studied local dialects, wrote stories which focused on life in speciflc regions of the country, and emphasized the "true" relationships between people. In doing so, they reflected broader trends in the society, such as industrialization, evolutionary theory which emphasized the effect of the environment on humans, and the influence of science.Realists such as Joel Chandler Harris and Ellen Glasgow depicted life in the South; Hamlin Garland described life on the Great Plains; and Sarah One Jewett wrote about everyday life in rural New England. Another realist, Bret Harte, achieved fame with stories that portrayed local life in the California mining camps. Samuel Clemens, who adopted the pen name Mark Twain, became the country's most outstanding realist author, observing life around him with a humorous and skeptical eye. In his stories and novels, Twain drew on his own experiences and used dialect and common speech instead of literary language, touching off a major change in American prose style.Other writers became impatient even with realism. Pushing evolutionary theory to its limits, they wrote of a world in which a cruel and merciless environment determined human fate. These writers, called naturalists, often focused on economic hardship, studying people struggling with poverty, and other aspects of urban and industrial life.Naturalists brought to their writing a passion for direct and honest experience. Theodore Dreiser, the foremost naturalist writer, in novels such as Sister Carrie, grimly portrayed a dark world in which human beings were tossed about by forces beyond their understanding or control. Dreiser thought that writers should tell the truth about human affairs, not fabricate romance, and Sister Carrie, he said, was "not intended as a piece of literary craftsmanship, but was a picture of conditions."Why does the author mention mining camps in line 14 ? 

Xem chi tiết 1.3 K lượt xem 5 năm trước

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.The economic depression in the late-nineteenth-century United States contributed significantly to a growing movement in literature toward realism and naturalism. After the 1870' s, a number of important authors began to reject the romanticism that had prevailed Line immediately following the Civil War of 1861-1865 and turned instead to realism.Determined to portray life as it was, with fldelity to real life and accurate representation without idealization, they studied local dialects, wrote stories which focused on life in speciflc regions of the country, and emphasized the "true" relationships between people. In doing so, they reflected broader trends in the society, such as industrialization, evolutionary theory which emphasized the effect of the environment on humans, and the influence of science.Realists such as Joel Chandler Harris and Ellen Glasgow depicted life in the South; Hamlin Garland described life on the Great Plains; and Sarah One Jewett wrote about everyday life in rural New England. Another realist, Bret Harte, achieved fame with stories that portrayed local life in the California mining camps. Samuel Clemens, who adopted the pen name Mark Twain, became the country's most outstanding realist author, observing life around him with a humorous and skeptical eye. In his stories and novels, Twain drew on his own experiences and used dialect and common speech instead of literary language, touching off a major change in American prose style.Other writers became impatient even with realism. Pushing evolutionary theory to its limits, they wrote of a world in which a cruel and merciless environment determined human fate. These writers, called naturalists, often focused on economic hardship, studying people struggling with poverty, and other aspects of urban and industrial life.Naturalists brought to their writing a passion for direct and honest experience. Theodore Dreiser, the foremost naturalist writer, in novels such as Sister Carrie, grimly portrayed a dark world in which human beings were tossed about by forces beyond their understanding or control. Dreiser thought that writers should tell the truth about human affairs, not fabricate romance, and Sister Carrie, he said, was "not intended as a piece of literary craftsmanship, but was a picture of conditions." The word "depicted" in line 11 is closest in meaning to

Xem chi tiết 347 lượt xem 5 năm trước

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.The economic depression in the late-nineteenth-century United States contributed significantly to a growing movement in literature toward realism and naturalism. After the 1870' s, a number of important authors began to reject the romanticism that had prevailed Line immediately following the Civil War of 1861-1865 and turned instead to realism.Determined to portray life as it was, with fldelity to real life and accurate representation without idealization, they studied local dialects, wrote stories which focused on life in speciflc regions of the country, and emphasized the "true" relationships between people. In doing so, they reflected broader trends in the society, such as industrialization, evolutionary theory which emphasized the effect of the environment on humans, and the influence of science.Realists such as Joel Chandler Harris and Ellen Glasgow depicted life in the South; Hamlin Garland described life on the Great Plains; and Sarah One Jewett wrote about everyday life in rural New England. Another realist, Bret Harte, achieved fame with stories that portrayed local life in the California mining camps. Samuel Clemens, who adopted the pen name Mark Twain, became the country's most outstanding realist author, observing life around him with a humorous and skeptical eye. In his stories and novels, Twain drew on his own experiences and used dialect and common speech instead of literary language, touching off a major change in American prose style.Other writers became impatient even with realism. Pushing evolutionary theory to its limits, they wrote of a world in which a cruel and merciless environment determined human fate. These writers, called naturalists, often focused on economic hardship, studying people struggling with poverty, and other aspects of urban and industrial life.Naturalists brought to their writing a passion for direct and honest experience. Theodore Dreiser, the foremost naturalist writer, in novels such as Sister Carrie, grimly portrayed a dark world in which human beings were tossed about by forces beyond their understanding or control. Dreiser thought that writers should tell the truth about human affairs, not fabricate romance, and Sister Carrie, he said, was "not intended as a piece of literary craftsmanship, but was a picture of conditions."Realist writers took an interest in all of the following EXCEPT 

Xem chi tiết 2.1 K lượt xem 5 năm trước

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.The economic depression in the late-nineteenth-century United States contributed significantly to a growing movement in literature toward realism and naturalism. After the 1870' s, a number of important authors began to reject the romanticism that had prevailed Line immediately following the Civil War of 1861-1865 and turned instead to realism.Determined to portray life as it was, with fldelity to real life and accurate representation without idealization, they studied local dialects, wrote stories which focused on life in speciflc regions of the country, and emphasized the "true" relationships between people. In doing so, they reflected broader trends in the society, such as industrialization, evolutionary theory which emphasized the effect of the environment on humans, and the influence of science.Realists such as Joel Chandler Harris and Ellen Glasgow depicted life in the South; Hamlin Garland described life on the Great Plains; and Sarah One Jewett wrote about everyday life in rural New England. Another realist, Bret Harte, achieved fame with stories that portrayed local life in the California mining camps. Samuel Clemens, who adopted the pen name Mark Twain, became the country's most outstanding realist author, observing life around him with a humorous and skeptical eye. In his stories and novels, Twain drew on his own experiences and used dialect and common speech instead of literary language, touching off a major change in American prose style.Other writers became impatient even with realism. Pushing evolutionary theory to its limits, they wrote of a world in which a cruel and merciless environment determined human fate. These writers, called naturalists, often focused on economic hardship, studying people struggling with poverty, and other aspects of urban and industrial life.Naturalists brought to their writing a passion for direct and honest experience. Theodore Dreiser, the foremost naturalist writer, in novels such as Sister Carrie, grimly portrayed a dark world in which human beings were tossed about by forces beyond their understanding or control. Dreiser thought that writers should tell the truth about human affairs, not fabricate romance, and Sister Carrie, he said, was "not intended as a piece of literary craftsmanship, but was a picture of conditions." According to the passage, a highly significant factor in the development of realist and naturalist literature was  

Xem chi tiết 557 lượt xem 5 năm trước

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.The economic depression in the late-nineteenth-century United States contributed significantly to a growing movement in literature toward realism and naturalism. After the 1870' s, a number of important authors began to reject the romanticism that had prevailed Line immediately following the Civil War of 1861-1865 and turned instead to realism.Determined to portray life as it was, with fldelity to real life and accurate representation without idealization, they studied local dialects, wrote stories which focused on life in speciflc regions of the country, and emphasized the "true" relationships between people. In doing so, they reflected broader trends in the society, such as industrialization, evolutionary theory which emphasized the effect of the environment on humans, and the influence of science.Realists such as Joel Chandler Harris and Ellen Glasgow depicted life in the South; Hamlin Garland described life on the Great Plains; and Sarah One Jewett wrote about everyday life in rural New England. Another realist, Bret Harte, achieved fame with stories that portrayed local life in the California mining camps. Samuel Clemens, who adopted the pen name Mark Twain, became the country's most outstanding realist author, observing life around him with a humorous and skeptical eye. In his stories and novels, Twain drew on his own experiences and used dialect and common speech instead of literary language, touching off a major change in American prose style.Other writers became impatient even with realism. Pushing evolutionary theory to its limits, they wrote of a world in which a cruel and merciless environment determined human fate. These writers, called naturalists, often focused on economic hardship, studying people struggling with poverty, and other aspects of urban and industrial life.Naturalists brought to their writing a passion for direct and honest experience. Theodore Dreiser, the foremost naturalist writer, in novels such as Sister Carrie, grimly portrayed a dark world in which human beings were tossed about by forces beyond their understanding or control. Dreiser thought that writers should tell the truth about human affairs, not fabricate romance, and Sister Carrie, he said, was "not intended as a piece of literary craftsmanship, but was a picture of conditions."The word "they" in line 8 refers to 

Xem chi tiết 2.6 K lượt xem 5 năm trước

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.The economic depression in the late-nineteenth-century United States contributed significantly to a growing movement in literature toward realism and naturalism. After the 1870' s, a number of important authors began to reject the romanticism that had prevailed Line immediately following the Civil War of 1861-1865 and turned instead to realism.Determined to portray life as it was, with fldelity to real life and accurate representation without idealization, they studied local dialects, wrote stories which focused on life in speciflc regions of the country, and emphasized the "true" relationships between people. In doing so, they reflected broader trends in the society, such as industrialization, evolutionary theory which emphasized the effect of the environment on humans, and the influence of science.Realists such as Joel Chandler Harris and Ellen Glasgow depicted life in the South; Hamlin Garland described life on the Great Plains; and Sarah One Jewett wrote about everyday life in rural New England. Another realist, Bret Harte, achieved fame with stories that portrayed local life in the California mining camps. Samuel Clemens, who adopted the pen name Mark Twain, became the country's most outstanding realist author, observing life around him with a humorous and skeptical eye. In his stories and novels, Twain drew on his own experiences and used dialect and common speech instead of literary language, touching off a major change in American prose style.Other writers became impatient even with realism. Pushing evolutionary theory to its limits, they wrote of a world in which a cruel and merciless environment determined human fate. These writers, called naturalists, often focused on economic hardship, studying people struggling with poverty, and other aspects of urban and industrial life.Naturalists brought to their writing a passion for direct and honest experience. Theodore Dreiser, the foremost naturalist writer, in novels such as Sister Carrie, grimly portrayed a dark world in which human beings were tossed about by forces beyond their understanding or control. Dreiser thought that writers should tell the truth about human affairs, not fabricate romance, and Sister Carrie, he said, was "not intended as a piece of literary craftsmanship, but was a picture of conditions."The word "prevailed" in line 3 is closest in meaning to 

Xem chi tiết 279 lượt xem 5 năm trước

Read the followingpassage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the question.It is estimated that over 99 percent of all species that ever existed have become extinct. What causes extinction? When a species is no longer adapted to a change environment, _it may perish. The exact causes of a species’ death vary from situation to situation. Rapid ecological change may render an environment hostile to a species. For example, temperatures may change and a species may not be adapt. Food resources may be affected by environmental changes, which will then cause problems for a species requiring these resources. Other species may become better adapted to an environment, resulting in competition and, ultimately,    in the death of a species.The fossil record reveals that extinction has occurred throughout the history of Earth. Recent analyses have also revealed that on some occasions many species became extinct at the same time - a mass extinction. One of the best - known examples of mass extinction occurred 65 million years ago with the demise of dinosaurs and many other forms of life. Perhaps the largest mass extinction was the one that occurred 225 million years ago, when approximately 95 percent of all species died. Mass extinctions can be caused by a relatively rapid change in the environment and can be worsened by the close interrelationship of many species. If, for example, something were to happen to destroy much of the plankton in the oceans, then the oxygen content of Earth would drop, affection even organisms not living in the oceans. Such a change would probably lead to a mass extinction.One interesting, and controversial, finding is that extinctions during the past 250 million years have tended to be more intense every 26 million years. The periodic extinction might be due to intersection of the earth’s orbit with a cloud of comets, but this theory is purely speculative. Some researchers have also speculated that extinction may often be random. That is, certain species may be eliminated and others may survive for no particular reason. A species’ survival may have nothing to do with its ability or inability to adapt. If so, some of revolutionary history may reflect a sequence of essentially random events. In paragraph 3, the author makes which of the foUowing statements about a species’ survival? 

Xem chi tiết 282 lượt xem 5 năm trước