Câu hỏi:
13/03/2020 759Read the following passage on transport, and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 43 to 50.
In addition to the great ridges and volcanic chains, the oceans conceal another form of undersea mountains: the strange guyot, or flat-topped seamount. No marine geologist even suspected the existence of these isolated mountains until they were discovered by geologist Harry H. Hess in 1946.
He was serving at the time as naval officer on a ship equipped with a fathometer. Hess named these truncated peaks for the nineteenth-century Swiss-born geologist Arnold Guyot, who had served on the faculty of Princeton University for thirty years. Since then, hundreds of guyots have been discovered in every ocean but the Arctic. Like offshore canyons, guyots present a challenge to oceanographic theory. They are believed to be extinct volcanoes. Their flat tops indicate that they once stood above or just below the surface, where the action of waves leveled off their peaks. Yet today, by definition, their summits are at least 600 feet below the surface, and some are as deep as 8,200 feet. Most lie between 3,200 feet and 6,500 feet. Their tops are not really flat but slope upward to a low pinnacle at the center. Dredging from the tops of guyots has recovered basalt and coral rubble, and that would be expected from the eroded tops of what were once islands. Some of this material is over 80 million years old. Geologists think the drowning of the guyots involved two processes: The great weight of the volcanic mountains depressed the sea floor beneath them, and the level of the sea rose a number of times, especially when the last Ice Age ended, some 8,000 to 11,000 years ago.
The passage implies that guyots were first detected by means of _____.
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Trả lời:
Giải bởi Vietjack
Đáp án D
No guyots have ever been found there.
Đoạn văn nói gì về Bắc Băng Dương
Thông tin nằm ở đoạn 2: “Since then, hundreds of guyots have been discovered in every ocean but the Arctic.” Kế từ đó, hàng trăm guyot đã được phát hiện ở tát cả các đại dương ngoại trừ Bắc Băng Dương.
Các phương án còn lại sai hoặc không được đê cập đến. A. Guyot đầu tiên được phát hiện ra ở đó. B. Các guyot không thể hình thành ở đây. C. Ở đó có nhiều guyot hơn tất cả những đại dương khác
Nhà sách VIETJACK:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
Câu 2:
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.
We decided to pay for the furniture on the installment plan.
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Câu 3:
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.
I didn’t know that you were at home. I didn’t drop in.
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Câu 4:
Being well-dress and punctual can help you create a good _____ on your interview.
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Câu 5:
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.
At school, people always used to take the mickey out of him for having red hair.
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Câu 6:
– Customer: “Can I have a look at that pullover, please?”
– Salesgirl: “_____.”
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Câu 7:
The man who lives opposite us sometimes comes _____ for a cup of coffee.
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