Câu hỏi:
05/04/2020 769Read 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 36 to 42.
The ability of falling cats to right themselves in midair and land on their feet has been a source of wonder for ages. Biologists long regarded it as an example of adaptation by natural selection, but for physicists it bordered on the miraculous.
Newton's laws of motion assume that the total amount of spin of a body cannot change unless an external torque speeds it up or slows it down. If a cat has no spin when it isreleased and experiences no external torque, it ought not to be able to twist around as it falls.
In the speed of its execution, the righting of a tumbling cat resembles a magician's trick. The gyrations of the cat in midair are too fast for the human eye to follow, so the process is obscured. Either the eye must be speeded up, or the cat's fall slowed down for the phenomenon to be observed. A century ago the former was accomplished by means of high-speed photography using equipment now available in any pharmacy. But in the nineteenth century the capture on film of a falling cat constituted a scientific experiment.
The experiment was described in a paper presented to the Paris Academy in 1894. Two sequences of twenty photographs each, one from the side and one from behind, show a white cat in the act of righting itself. Grainy and quaint though they are, the photos show that the cat was dropped upside down, with no initial spin, and still landed on its feet. Careful analysis of the photos reveals the secret; as the cat rotates the front of its body clockwise, the rear and tail twist counterclockwise, so that the total spin remains zero, in perfect accord with Newton's laws. Halfway down, the cat pulls in its legs before reversing its twist and then extends them again, with the desired end result. The explanation was that while nobody can acquire spin without torque, a flexible one can readily change its orientation, or phase. Cats know this instinctively, but scientists could not be sure how it happened until they increased the speed of their perceptions a thousandfold.
What does the passage mainly discuss?
Đáp án chính xác
Câu hỏi trong đề:
20 Đề thi thử Tiếng Anh năm 2020 chuẩn cấu trúc bộ giáo dục !!
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Trả lời:
Giải bởi Vietjack
Đáp án A
Giải thích: Bài đọc xoay quanh việc giải thích hiện tượng mèo có thể xoay mình khi bị thả từ trên cao xuống và đáp xuống đất bằng bốn chân an toàn.
Phương án A. The explanation of an interesting phenomenon = Một lời giải thích cho một hiện tượng thú vị, là phương án thể hiện chủ đề của bài chính xác nhất.
B. Miracles in modern science = Phép lạ trong khoa học hiện đại
C. Procedures in scientific investigation = Thủ tục trong nghiên cứu khoa học
D. The differences between biology and physics = Sự khác biệt giữa sinh học và vật lý.
Nhà sách VIETJACK:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 1:
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.
The International Organizations are going to be in a temporary way in the country
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Câu 2:
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
Calling Jim is pointless. His phone is out of order
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Câu 3:
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
“I didn’t break the window,” Jim said
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Câu 4:
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
I read two books, but I didn’t find them interesting
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Câu 5:
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.
His wife helped him. He was able to finish his book
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Câu 6:
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
It was his lack of confidence that surprised me
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Câu 7:
Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
The rings of Saturn are so distant to be seen from Earth without a telescope
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