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Tổng hợp đề ôn tập thi THPTQG môn Sinh Học có đáp án (Đề số 8)

Ở người, alen a gây bệnh máu khó đông nằm trên vùng không tương đồng của nhiễm sắc thể X; alen A quy định máu đông bình thường. Trong một gia đình, bố mẹ (P) bình thường sinh một đứa con bị hội chứng Claiphentơ đồng thời mắc bệnh máu khó đông. Nhận xét nào sau đây đúng?

Sinh học Tốt nghiệp THPT
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Bài 7: Bảng tuần hoàn các nguyên tố hóa học

Bảng tuần hoàn có bao nhiêu nhóm B? Các nhóm B gồm bao nhiêu cột?

Hóa học Lớp 10
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Bài 7: Bảng tuần hoàn các nguyên tố hóa học

Bảng tuần hoàn có bao nhiêu nhóm A?

Hóa học Lớp 10
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Đề ôn luyện thi THPTQG Sinh Học có lời giải (Đề số 14)

Nhận định nào sau đây là đúng về phân tử ARN?

Sinh học Tốt nghiệp THPT
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Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 12)

Read the following passage and blacken the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.         The history of clinical nutrition, or the study of the relationship between health and how the body takes in and utilizes food substances, can be divided into four distinct eras: the first began in the nineteenth century and extended into the early twentieth century when it was recognized for the first time that food contained constituents that were essential for human function and that different foods provided different amounts of these essential agents. Near the end of this era, research studies demonstrated that rapid weight loss was associated with nitrogen imbalance and could only be rectified by providing adequate dietary protein associated with certain foods.        The second era was initiated in the early decades of the twentieth century and might be called “the vitamin period.” Vitamins came to be recognized in foods, and deficiency syndromes were described. As vitamins became recognized as essential food constituents necessary for health, it became tempting to suggest that every disease and condition for which there had been no previous effective treatment might be responsive to vitamin therapy. At that point in time, medical schools started to become more interested in having their curricula integrate nutritional concepts into the basic sciences. Much of the focus of this education was on the recognition of deficiency symptoms. Herein lay the beginning of what ultimately turned from ignorance to denial of the value of nutritional therapies in medicine. Reckless claims were made for effects of vitamins that went far beyond what could actually be achieved from the use of them.         In the third era of nutritional history in the early 1950's to mid-1960's, vitamin therapy began to fall into disrepute. Concomitant with this, nutrition education in medical schools also became less popular. It was just a decade before this that many drug companies had found their vitamin sales skyrocketing and were quick to supply practicing physicians with generous samples of vitamins and literature extolling the virtue of supplementation for a variety of health-related conditions. Expectations as to the success of vitamins in disease control were exaggerated. As is known in retrospect, vitamin and mineral therapies are much less effective when applied to health-crisis conditions than when applied to long-term problems of under nutrition that lead to chronic health problems. It can be inferred from the passage that which of the following discoveries was made during the first era in the history of nutrition?

Tiếng Anh Tốt nghiệp THPT
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Bài 7: Bảng tuần hoàn các nguyên tố hóa học

Bảng tuần hoàn các nguyên tố có bao nhiêu cột?

Hóa học Lớp 10
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187 Bài trắc nghiệm Hàm số từ đề6) thi thử THPTQG 2019 cục hay có lời giải(P

hàm số y = f(x) có bảng biến thiên như hình dưới.Số giá trị nguyên của tham số m để phương trình fx=mcó 6 nghiệm phân biệt là

Toán Lớp 12
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500 bài tập lí thuyết Hóa Học nâng cao có lời giải (P7)

Cho các phát biểu sau : (1). Hiđro hóa triolein ( lỏng)  có xúc tác Ni, đun nóng thu được tristearin ( rắn). (2). Ở nhiệt độ thường, Cu(OH)2tan được trong dung dịch saccarozơ. (3). Axit glutamic là hợp chất lưỡng tính. (4). Các peptit có từ hai liên kết peptit trở lên đều  tham gia phản ứng màu biure . (5). Đồng phân của saccarozơ là fructozơ (6). Tinh bột và xenlulozơ là các polisaccarit và được tạo thành từ các gốc α-glucozơ (7). Trong dung dịch glucozơ và fructozơ đều tồn tạo chủ yếu ở dạng mạch vòng (8). Xenlulozơ và amilopectin đều có mạch không phân nhánh Số phát biểu đúng là 

Hóa học Tốt nghiệp THPT
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25 Bộ đề Ôn luyện thi THPTQG môn Sinh Học cực hay có lời giải (Đề số 25)

Ở một loài thực vật, gen A quy định hạt có khả năng nảy mầm trên đất bị nhiễm mặn trội hoàn toàn so với alen a quy định hạt không có khả năng này. Từ một quần thể đang ở trạng thái cân bằng di truyền thu được tổng số 2000 hạt. Đem gieo các hạt này trên một vùng đất bị nhiễm mặn thì thấy có 1280 hạt nảy mầm. Trong số các hạt nảy mầm, số lượng hạt có kiểu gen đồng hợp tính chiếm tỉ lệ là:

Sinh học Tốt nghiệp THPT
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 8)

Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions. I've never seen such a nice bouquet of wedding flowers.

Tiếng Anh Tốt nghiệp THPT
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Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 12)

Read the following passage and blacken the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.         The history of clinical nutrition, or the study of the relationship between health and how the body takes in and utilizes food substances, can be divided into four distinct eras: the first began in the nineteenth century and extended into the early twentieth century when it was recognized for the first time that food contained constituents that were essential for human function and that different foods provided different amounts of these essential agents. Near the end of this era, research studies demonstrated that rapid weight loss was associated with nitrogen imbalance and could only be rectified by providing adequate dietary protein associated with certain foods.        The second era was initiated in the early decades of the twentieth century and might be called “the vitamin period.” Vitamins came to be recognized in foods, and deficiency syndromes were described. As vitamins became recognized as essential food constituents necessary for health, it became tempting to suggest that every disease and condition for which there had been no previous effective treatment might be responsive to vitamin therapy. At that point in time, medical schools started to become more interested in having their curricula integrate nutritional concepts into the basic sciences. Much of the focus of this education was on the recognition of deficiency symptoms. Herein lay the beginning of what ultimately turned from ignorance to denial of the value of nutritional therapies in medicine. Reckless claims were made for effects of vitamins that went far beyond what could actually be achieved from the use of them.         In the third era of nutritional history in the early 1950's to mid-1960's, vitamin therapy began to fall into disrepute. Concomitant with this, nutrition education in medical schools also became less popular. It was just a decade before this that many drug companies had found their vitamin sales skyrocketing and were quick to supply practicing physicians with generous samples of vitamins and literature extolling the virtue of supplementation for a variety of health-related conditions. Expectations as to the success of vitamins in disease control were exaggerated. As is known in retrospect, vitamin and mineral therapies are much less effective when applied to health-crisis conditions than when applied to long-term problems of under nutrition that lead to chronic health problems. What does the passage mainly discuss?

Tiếng Anh Tốt nghiệp THPT
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Đề ôn luyện thi THPTQG Sinh Học có lời giải (Đề số 14)

Con người thích nghi với môi trường chủ yếu thông qua:

Sinh học Tốt nghiệp THPT
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Tổng hợp đề luyện thi Đại Học môn Tiếng Anh có lời giải(Đề số 15)

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 35 to 42. In the West, cartoons are used chiefly to make people laugh. The important feature of all these cartoons is the joke and the element of surprise which is contained. Even though it is very funny, a good cartoon is always based on close observation of a particular feature of life and usually has a serious purpose. Cartoons in the West have been associated with political and social matters for many years. In wartime, for example, they proved to be an excellent way of spreading propaganda. Nowadays cartoons are often used to make short, sharp comments on politics and governments as well as on a variety of social matters. In this way, the modern cartoon has become a very powerful force in influencing people in Europe and the United States. Unlike most American and European cartoons, however, many Chinese cartoon drawings in the past have also attempted to educate people, especially those who could not read and write. Such cartoons about the lives and sayings of great men in China have proved extremely useful in bringing education to illiterate and semiliterate people throughout China. Confucius, Mencius and Laozi have all appeared in very interesting stories presented in the form of cartoons. The cartoons themselves have thus served to illustrate the teachings of the Chinese sages in a very attractive way. In this sense, many Chinese cartoons are different from Western cartoons in so far as they do not depend chiefly on telling jokes. Often, there is nothing to laugh at when you see Chinese cartoons. This is not their primary aim. In addition to commenting on serious political and social matters, Chinese cartoons have aimed at spreading the traditional Chinese thoughts and culture as widely as possible among the people. Today, however, Chinese cartoons have an added part to play in spreading knowledge. They offer a very attractive and useful way of reaching people throughout the world, regardless of the particular country in which they live. Thus, through cartoons, the thoughts and teachings of the old Chinese philosophers and sages can now reach people who live in such countries as Britain, France, America, Japan, Malaysia or Australia and who are unfamiliar with the Chinese culture. Until recently, the transfer of knowledge and culture has been overwhelmingly from the West to the East and not vice versa. By means of cartoons, however, publishing companies in Taiwan, Hong Kong and Singapore are now having success in correcting this imbalance between the East and the West. Cartoons can overcome language barriers in all foreign countries. The vast increase in the popularity of these cartoons serves to illustrate the truth of Confucius’s famous saying “One picture is worth a thousand words.” This passage is intended to present ______.

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề ôn tập thi THPTQG môn Sinh Học có đáp án (Đề số 8)

Trong một chuỗi thức ăn, mối quan hệ giữa các loài sinh vật ở các bậc dinh dưỡng liền kề là

Sinh học Tốt nghiệp THPT
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Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 27)

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. Question 19: Wendy is on the horns of a dilemma: she just wonders whether to go for a picnic with her friends or to stay at home with her family.

Tiếng Anh Tốt nghiệp THPT
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30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 13)

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the question. The day after Thanksgiving is the start of the holiday shopping season. Thanksgiving is always on a Thursday, so the day after is a Friday. This day has come to be known as Black Friday. It has been the busiest shopping day of the year since 2005. Most stores offer great deals on Black Friday. They open their doors in the wee hours of the morning. They try to attract shoppers with big discounts. Some items like TVs are much cheaper than usual. Stores may even lose money on these items. They hope that shoppers will buy gifts for other people while they are in the store. Black Friday is a great time to get good deals. The problem is that there are not enough low-priced items to go around. Each store may only have a few. These items are in high demand. People stand in long lines to get such great deals. They may line up hours before a store opens. They may be hoping to get a low price on a TV or laptop, but not everyone who wants one will get one. Some people leave disappointed. The situation can be tense. Some Black Friday events have been Violent. Large, eager crowds have trampled workers. Fights have broken out or people have been cutting in line. People have shot one another over parking spots. But most Black Friday events are safe and fun. Still, if you plan on going, expect large crowds and a bit of shoving. The word "trampled" in paragraph 3 mostly means _______

Tiếng Anh Tốt nghiệp THPT
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Bài 6: Luyện tập: Cấu tạo vỏ nguyên tử

Viết cấu hình electron đầy đủ cho các nguyên tử có lớp electron ngoài cùng là: 3s23p6.

Hóa học Lớp 10
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Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 12)

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề luyện thi Đại Học môn Tiếng Anh có lời giải(Đề số 15)

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 35 to 42. In the West, cartoons are used chiefly to make people laugh. The important feature of all these cartoons is the joke and the element of surprise which is contained. Even though it is very funny, a good cartoon is always based on close observation of a particular feature of life and usually has a serious purpose. Cartoons in the West have been associated with political and social matters for many years. In wartime, for example, they proved to be an excellent way of spreading propaganda. Nowadays cartoons are often used to make short, sharp comments on politics and governments as well as on a variety of social matters. In this way, the modern cartoon has become a very powerful force in influencing people in Europe and the United States. Unlike most American and European cartoons, however, many Chinese cartoon drawings in the past have also attempted to educate people, especially those who could not read and write. Such cartoons about the lives and sayings of great men in China have proved extremely useful in bringing education to illiterate and semiliterate people throughout China. Confucius, Mencius and Laozi have all appeared in very interesting stories presented in the form of cartoons. The cartoons themselves have thus served to illustrate the teachings of the Chinese sages in a very attractive way. In this sense, many Chinese cartoons are different from Western cartoons in so far as they do not depend chiefly on telling jokes. Often, there is nothing to laugh at when you see Chinese cartoons. This is not their primary aim. In addition to commenting on serious political and social matters, Chinese cartoons have aimed at spreading the traditional Chinese thoughts and culture as widely as possible among the people. Today, however, Chinese cartoons have an added part to play in spreading knowledge. They offer a very attractive and useful way of reaching people throughout the world, regardless of the particular country in which they live. Thus, through cartoons, the thoughts and teachings of the old Chinese philosophers and sages can now reach people who live in such countries as Britain, France, America, Japan, Malaysia or Australia and who are unfamiliar with the Chinese culture. Until recently, the transfer of knowledge and culture has been overwhelmingly from the West to the East and not vice versa. By means of cartoons, however, publishing companies in Taiwan, Hong Kong and Singapore are now having success in correcting this imbalance between the East and the West. Cartoons can overcome language barriers in all foreign countries. The vast increase in the popularity of these cartoons serves to illustrate the truth of Confucius’s famous saying “One picture is worth a thousand words.” The word “imbalance” in paragraph 6 refers to ______.

Tiếng Anh Tốt nghiệp THPT
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 8)

Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning to each of the following questions. He died in 1960. Re received the bravery award in 1970.

Tiếng Anh Tốt nghiệp THPT
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Bài 6: Luyện tập: Cấu tạo vỏ nguyên tử

Viết cấu hình electron đầy đủ cho các nguyên tử có lớp electron ngoài cùng là: 3s23p5.

Hóa học Lớp 10
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Tổng hợp đề ôn tập thi THPTQG môn Sinh Học có đáp án (Đề số 8)

Khi tiến hành thí nghiệm lai một tính trạng, Menđen đã phát hiện ra sự tương tác giữa các alen của cùng một gen trong quá trình hình thành kiểu hình là

Sinh học Tốt nghiệp THPT
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Bài 6: Luyện tập: Cấu tạo vỏ nguyên tử

Viết cấu hình electron đầy đủ cho các nguyên tử có lớp electron ngoài cùng là: 3s23p3.

Hóa học Lớp 10
Xem chi tiết 6.9 K lượt xem 1 năm trước
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 12)

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề luyện thi Đại Học môn Tiếng Anh có lời giải(Đề số 15)

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 35 to 42. In the West, cartoons are used chiefly to make people laugh. The important feature of all these cartoons is the joke and the element of surprise which is contained. Even though it is very funny, a good cartoon is always based on close observation of a particular feature of life and usually has a serious purpose. Cartoons in the West have been associated with political and social matters for many years. In wartime, for example, they proved to be an excellent way of spreading propaganda. Nowadays cartoons are often used to make short, sharp comments on politics and governments as well as on a variety of social matters. In this way, the modern cartoon has become a very powerful force in influencing people in Europe and the United States. Unlike most American and European cartoons, however, many Chinese cartoon drawings in the past have also attempted to educate people, especially those who could not read and write. Such cartoons about the lives and sayings of great men in China have proved extremely useful in bringing education to illiterate and semiliterate people throughout China. Confucius, Mencius and Laozi have all appeared in very interesting stories presented in the form of cartoons. The cartoons themselves have thus served to illustrate the teachings of the Chinese sages in a very attractive way. In this sense, many Chinese cartoons are different from Western cartoons in so far as they do not depend chiefly on telling jokes. Often, there is nothing to laugh at when you see Chinese cartoons. This is not their primary aim. In addition to commenting on serious political and social matters, Chinese cartoons have aimed at spreading the traditional Chinese thoughts and culture as widely as possible among the people. Today, however, Chinese cartoons have an added part to play in spreading knowledge. They offer a very attractive and useful way of reaching people throughout the world, regardless of the particular country in which they live. Thus, through cartoons, the thoughts and teachings of the old Chinese philosophers and sages can now reach people who live in such countries as Britain, France, America, Japan, Malaysia or Australia and who are unfamiliar with the Chinese culture. Until recently, the transfer of knowledge and culture has been overwhelmingly from the West to the East and not vice versa. By means of cartoons, however, publishing companies in Taiwan, Hong Kong and Singapore are now having success in correcting this imbalance between the East and the West. Cartoons can overcome language barriers in all foreign countries. The vast increase in the popularity of these cartoons serves to illustrate the truth of Confucius’s famous saying “One picture is worth a thousand words.” The pronoun “this” in paragraph 4 mostly refers to ______.

Tiếng Anh Tốt nghiệp THPT
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 8)

Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions. He acknowledges that sometime art simply holds up a mirror to the society it is born from.

Tiếng Anh Tốt nghiệp THPT
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187 Bài trắc nghiệm Hàm số từ đề6) thi thử THPTQG 2019 cục hay có lời giải(P

Cho hàm số y=f(x) có bảng biến thiên như sauTập hợp tất cả các giá trị của tham số m để phương trình f(x) + m =0 có 2 nghiệm phân biệt là

Toán Lớp 12
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Bài 6: Luyện tập: Cấu tạo vỏ nguyên tử

Viết cấu hình electron đầy đủ cho các nguyên tử có lớp electron ngoài cùng là: 2s22p6.

Hóa học Lớp 10
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Tổng hợp đề ôn tập thi THPTQG môn Sinh Học có đáp án (Đề số 8)

Trong những cơ chế hình thành loài sau: (1) Hình thành loài bằng cách li địa lí. (2) Hình thành loài bằng cách li tập tính. (3) Hình thành loài bằng cách li sinh thái. (4) Hình thành loài bằng lai xa kèm đa bội hóa. Có bao nhiêu cơ chế có thể xảy ra ở cả động vật và thực vật?

Sinh học Tốt nghiệp THPT
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Tổng hợp đề luyện thi Đại Học môn Tiếng Anh có lời giải(Đề số 15)

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 35 to 42. In the West, cartoons are used chiefly to make people laugh. The important feature of all these cartoons is the joke and the element of surprise which is contained. Even though it is very funny, a good cartoon is always based on close observation of a particular feature of life and usually has a serious purpose. Cartoons in the West have been associated with political and social matters for many years. In wartime, for example, they proved to be an excellent way of spreading propaganda. Nowadays cartoons are often used to make short, sharp comments on politics and governments as well as on a variety of social matters. In this way, the modern cartoon has become a very powerful force in influencing people in Europe and the United States. Unlike most American and European cartoons, however, many Chinese cartoon drawings in the past have also attempted to educate people, especially those who could not read and write. Such cartoons about the lives and sayings of great men in China have proved extremely useful in bringing education to illiterate and semiliterate people throughout China. Confucius, Mencius and Laozi have all appeared in very interesting stories presented in the form of cartoons. The cartoons themselves have thus served to illustrate the teachings of the Chinese sages in a very attractive way. In this sense, many Chinese cartoons are different from Western cartoons in so far as they do not depend chiefly on telling jokes. Often, there is nothing to laugh at when you see Chinese cartoons. This is not their primary aim. In addition to commenting on serious political and social matters, Chinese cartoons have aimed at spreading the traditional Chinese thoughts and culture as widely as possible among the people. Today, however, Chinese cartoons have an added part to play in spreading knowledge. They offer a very attractive and useful way of reaching people throughout the world, regardless of the particular country in which they live. Thus, through cartoons, the thoughts and teachings of the old Chinese philosophers and sages can now reach people who live in such countries as Britain, France, America, Japan, Malaysia or Australia and who are unfamiliar with the Chinese culture. Until recently, the transfer of knowledge and culture has been overwhelmingly from the West to the East and not vice versa. By means of cartoons, however, publishing companies in Taiwan, Hong Kong and Singapore are now having success in correcting this imbalance between the East and the West. Cartoons can overcome language barriers in all foreign countries. The vast increase in the popularity of these cartoons serves to illustrate the truth of Confucius’s famous saying “One picture is worth a thousand words.” Which of the following clearly characterizes Western cartoons?

Tiếng Anh Tốt nghiệp THPT
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 8)

Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions. Annoying by the receptionist's behaviour, they decided not to stay in that hotel.

Tiếng Anh Tốt nghiệp THPT
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Bài 6: Luyện tập: Cấu tạo vỏ nguyên tử

Viết cấu hình electron đầy đủ cho các nguyên tử có lớp electron ngoài cùng là: 2s22p3.

Hóa học Lớp 10
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Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 27)

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word (s) in each of the following questions. Question 18: People in the mountainous areas are still in the habit of destroying forests for cultivation.

Tiếng Anh Tốt nghiệp THPT
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Đề ôn luyện thi THPTQG Sinh Học có lời giải (Đề số 14)

Trong quá trình dịch mã, mARN thường gắn với một nhóm ribôxôm gọi là poliribôxôm giúp

Sinh học Tốt nghiệp THPT
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30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 13)

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the question. The day after Thanksgiving is the start of the holiday shopping season. Thanksgiving is always on a Thursday, so the day after is a Friday. This day has come to be known as Black Friday. It has been the busiest shopping day of the year since 2005. Most stores offer great deals on Black Friday. They open their doors in the wee hours of the morning. They try to attract shoppers with big discounts. Some items like TVs are much cheaper than usual. Stores may even lose money on these items. They hope that shoppers will buy gifts for other people while they are in the store. Black Friday is a great time to get good deals. The problem is that there are not enough low-priced items to go around. Each store may only have a few. These items are in high demand. People stand in long lines to get such great deals. They may line up hours before a store opens. They may be hoping to get a low price on a TV or laptop, but not everyone who wants one will get one. Some people leave disappointed. The situation can be tense. Some Black Friday events have been Violent. Large, eager crowds have trampled workers. Fights have broken out or people have been cutting in line. People have shot one another over parking spots. But most Black Friday events are safe and fun. Still, if you plan on going, expect large crowds and a bit of shoving. Which best explains the main idea of the third paragraph?

Tiếng Anh Tốt nghiệp THPT
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500 bài tập lí thuyết Hóa Học nâng cao có lời giải (P7)

Cho các phát biểu sau: (1) Fructozơ và glucozơ đều có khả năng tham gia phản ứng tráng bạc (2) Saccarozơ không có cấu tạo dạng mạch hở (3) Tinh bột và xenlulozơ đều thuộc loại polisaccarit (4) Xenlulozơ và amilozơ đều có mạch không phân nhánh (5). Este isoamyl axetat có mùi chuối chín (6). Muối mononatri của axit glutamic là thành phần chính của bột ngọt (7). Phản ứng xà phòng hóa chất béo là phản ứng thuận nghịch (8). Poli(metyl metacrylat) được dùng để chế tạo thủy tinh hữu cơ Số phát biểu đúng là

Hóa học Tốt nghiệp THPT
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Tổng hợp đề luyện thi Đại Học môn Tiếng Anh có lời giải(Đề số 15)

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 35 to 42. In the West, cartoons are used chiefly to make people laugh. The important feature of all these cartoons is the joke and the element of surprise which is contained. Even though it is very funny, a good cartoon is always based on close observation of a particular feature of life and usually has a serious purpose. Cartoons in the West have been associated with political and social matters for many years. In wartime, for example, they proved to be an excellent way of spreading propaganda. Nowadays cartoons are often used to make short, sharp comments on politics and governments as well as on a variety of social matters. In this way, the modern cartoon has become a very powerful force in influencing people in Europe and the United States. Unlike most American and European cartoons, however, many Chinese cartoon drawings in the past have also attempted to educate people, especially those who could not read and write. Such cartoons about the lives and sayings of great men in China have proved extremely useful in bringing education to illiterate and semiliterate people throughout China. Confucius, Mencius and Laozi have all appeared in very interesting stories presented in the form of cartoons. The cartoons themselves have thus served to illustrate the teachings of the Chinese sages in a very attractive way. In this sense, many Chinese cartoons are different from Western cartoons in so far as they do not depend chiefly on telling jokes. Often, there is nothing to laugh at when you see Chinese cartoons. This is not their primary aim. In addition to commenting on serious political and social matters, Chinese cartoons have aimed at spreading the traditional Chinese thoughts and culture as widely as possible among the people. Today, however, Chinese cartoons have an added part to play in spreading knowledge. They offer a very attractive and useful way of reaching people throughout the world, regardless of the particular country in which they live. Thus, through cartoons, the thoughts and teachings of the old Chinese philosophers and sages can now reach people who live in such countries as Britain, France, America, Japan, Malaysia or Australia and who are unfamiliar with the Chinese culture. Until recently, the transfer of knowledge and culture has been overwhelmingly from the West to the East and not vice versa. By means of cartoons, however, publishing companies in Taiwan, Hong Kong and Singapore are now having success in correcting this imbalance between the East and the West. Cartoons can overcome language barriers in all foreign countries. The vast increase in the popularity of these cartoons serves to illustrate the truth of Confucius’s famous saying “One picture is worth a thousand words.” Which of the following could be the best title for the passage?

Tiếng Anh Tốt nghiệp THPT
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 8)

Mark the letter A, B, C or D to indicate the underlined part that needs correction in each of the following questions. These companies were accused on having released a large amount  of carbon dioxide into the atmosphere.

Tiếng Anh Tốt nghiệp THPT
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Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 27)

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) CLOSEST in meaning to the underlined word (s) in each of the following questions. Question 17: The maintenance of these old castles must cost a lot of money.

Tiếng Anh Tốt nghiệp THPT
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25 Bộ đề Ôn luyện thi THPTQG môn Sinh Học cực hay có lời giải (Đề số 25)

Trong một quần thể thực vật giao phấn, xét một lôcut có hai alen, alen A quy định thân cao trội hoàn toàn so với alen a quy định thân thấp, gen quy định tính trạng trên NST thường. Quần thể ban đầu (P) có kiểu hình thân thấp chiếm ti lệ 10%. Sau một thế hệ ngẫu phối và không chịu tác động của các nhân tố tiến hóa. kiểu hình thân thấp ở thế hệ con chiếm tỉ lệ 12,25%. Tính theo lý thuyết, thành phần kiểu gen của quần thể (P) là:

Sinh học Tốt nghiệp THPT
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Tổng hợp đề ôn tập thi THPTQG môn Sinh Học có đáp án (Đề số 8)

Ở bò, kiểu gen AA quy định lông đen; kiểu gen Aa quy định lông đốm; kiểu gen aa quy định lông vàng; alen B quy định không sừng trội hoàn toàn so với alen b quy định có sừng; alen D quy định chân cao trội hoàn toàn so với alen d quy định chân ngắn. Biết các cặp gen nằm trên các cặp nhiễm sắc thể thường khác nhau. Để đời con thu được kiểu hình phân li theo tỉ lệ 18 : 9 : 9 : 6 : 6 : 3 : 3 : 3 : 3 : 2 : 1 : 1 kiểu gen của bố mẹ là

Sinh học Tốt nghiệp THPT
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500 bài tập lí thuyết Hóa Học nâng cao có lời giải (P7)

Cho các nhận định sau: (1). Cao su buna – S được điều chế từ đồng trùng hợp buta – 1,3 – đien và lưu huỳnh. (2). Nilon – 6,6 được điều chế từ đồng trùng hợp hexametylenđiamin và axit ađipic. (3). Tơ axetat, tơ visco thuộc loại tơ hóa học. (4). Glicogen và amilozơ có cấu trúc mạch phân nhánh. (5). Cho dung dịch HCl đặc vào anilin thì anilin tan dần (6). Anilin có tính bazơ nhưng không làm đổi màu quỳ tím (7). Anilin tan tốt trong nước, tạo dung dịch trong suốt. (8). Lực bazơ của anilin yếu hơn lực bazơ của metylamin Số nhận định đúng là

Hóa học Tốt nghiệp THPT
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30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 8)

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the question. Urban populations interact with their environment. Urban people change their environment through their consumption of Food, energy, water, and land. And in turn, the polluted urban environment affects the health and quality of life of the urban population. People who live in urban areas have very different consumption patterns than residents in rural areas. For example, urban populations consume much more food, energy, and durable goods than rural populations. In China during the 1970s, the urban populations consumed twice as much pork as the rural populations who were raising the pigs. With economic development, the difference in consumption declined as the rural populations ate better diets. But even a decade later, urban populations had 60 percent more pork in their diets than rural populations. The increasing consumption of meat is a sign of growing affluence in Beijing; in India where many urban residents are vegetarians, greater prosperity is seen in higher consumption of milk. Urban populations not only consume more food, but they also consume more durable goods, In the early 1990s, Chinese households in urban areas were two times more likely to have a TV, eight times more likely to have a washing machine, and 25 times more likely to have a refrigerator than rural households. This increased consumption is a function of urban labor markets, wages, and household structure. Urban consumption of energy helps create heat islands that can change local weather patterns and weather downwind from the heat islands. The heat island phenomenon is created because cities radiate heat back into the atmosphere at rate 15 percent to 30 percent less than rural areas. The combination of the increased energy consumption and difference in albedo (radiation) means that cities are warmer than rural areas (0.6 to 1.3 C), And these heat islands become traps for atmospheric pollutants. Cloudiness and fog occur with greater frequency. Precipitation is 5 percent to 10 percent higher in cities; thunderstorms and hailstorms are much more frequent, but snow days in cities are less common. Urbanization also affects the broader regional environments. Regions downwind from large industrial complexes also see increases in the amount of precipitation, air pollution, and the number of days with thunderstorms. Urban areas affect not only the weather patterns, but also the runoff patterns for water. Urban areas generally generate more rain, but they reduce the infiltration of water and lower the water tables. This means that runoff occurs more rapidly with greater peak flows. Flood volumes increase, as do floods and water pollution downstream. Many of the effects of urban areas on the environment are not necessarily linear. Bigger urban areas do not always create more environmental problems. And small urban areas can cause large problems. Much of what determines the extent of the environmental impacts is how the urban populations behave - their consumption and living patterns - not just how large they are. What can be inferred in the last paragraph?

Tiếng Anh Tốt nghiệp THPT
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Bài 6: Luyện tập: Cấu tạo vỏ nguyên tử

Cho biết tên, kí hiệu, số hiệu nguyên tử của: 2 nguyên tố có 7 electron ở lớp ngoài cùng.

Hóa học Lớp 10
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Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 27)

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Question 16: The British and the American share the same language, but in other aspects they are as different as _______.

Tiếng Anh Tốt nghiệp THPT
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Tổng hợp đề ôn thi THPTQG môn Hóa Học cực hay có lời giải (Đề số 13)

Đốt cháy hoàn toàn m gam hỗn hợp X gồm fructozơ, metyl fomat, anđehit fomic và glixerol. Sau phản ứng thu được 16,8 lít khí CO2 (đktc) và 16,2 gam H2O. Thành phần % theo khối lượng của glixerol trong hỗn hợp X là

Hóa học Tốt nghiệp THPT
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Bài 6: Luyện tập: Cấu tạo vỏ nguyên tử

Cho biết tên, kí hiệu, số hiệu nguyên tử của: 2 nguyên tố có 1 electron ở lớp ngoài cùng.

Hóa học Lớp 10
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30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 13)

Read the following passage and mark the letter A, B, C, or D to indicate the correct answer to each of the question. The day after Thanksgiving is the start of the holiday shopping season. Thanksgiving is always on a Thursday, so the day after is a Friday. This day has come to be known as Black Friday. It has been the busiest shopping day of the year since 2005. Most stores offer great deals on Black Friday. They open their doors in the wee hours of the morning. They try to attract shoppers with big discounts. Some items like TVs are much cheaper than usual. Stores may even lose money on these items. They hope that shoppers will buy gifts for other people while they are in the store. Black Friday is a great time to get good deals. The problem is that there are not enough low-priced items to go around. Each store may only have a few. These items are in high demand. People stand in long lines to get such great deals. They may line up hours before a store opens. They may be hoping to get a low price on a TV or laptop, but not everyone who wants one will get one. Some people leave disappointed. The situation can be tense. Some Black Friday events have been Violent. Large, eager crowds have trampled workers. Fights have broken out or people have been cutting in line. People have shot one another over parking spots. But most Black Friday events are safe and fun. Still, if you plan on going, expect large crowds and a bit of shoving. Which is NOT true about Black Friday?

Tiếng Anh Tốt nghiệp THPT
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Đề minh hoạ kỳ thi THPTQG 2019 môn Hoá học có đáp án (Đề 14)

Phân đạm ure thường chỉ chứa 46% N về khối lượng. Khối lượng phân ure đủ để cung cấp 70,0 kg N là

Hóa học Tốt nghiệp THPT
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Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết (Đề số 12)

Mark the letter A, B, C, or D on your answer sheet to indicate the word that differs from the other three in the position ofprimary stress in each of the following questions.

Tiếng Anh Tốt nghiệp THPT
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