Câu hỏi:
13/03/2020 538Read 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.
What is the author’s main purpose in writing this passage?
Đáp án chính xác
Câu hỏi trong đề:
20 Đề thi thử THPTQG môn Tiếng Anh cực hay có đáp án !!
Sách mới 2k7: Tổng ôn Toán, Lí, Hóa, Văn, Sử, Địa…. kỳ thi tốt nghiệp THPT Quốc gia 2025, đánh giá năng lực (chỉ từ 110k).
Quảng cáo
Trả lời:
Giải bởi Vietjack
Đáp án A
hide
Conceal sb/ st: (v) che giấu, giấu giếm ≈ hide: (v) che giấu
Create: tạo ra
Erode: xói mòn
Contain: chứa
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.
Xem đáp án »
13/03/2020
24,044
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.
Xem đáp án »
23/03/2020
22,445
Câu 4:
Being well-dress and punctual can help you create a good _____ on your interview.
Xem đáp án »
22/03/2020
21,743
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.
Xem đáp án »
13/03/2020
19,718
Câu 6:
– Customer: “Can I have a look at that pullover, please?”
– Salesgirl: “_____.”
Xem đáp án »
23/03/2020
17,101
Câu 7:
The man who lives opposite us sometimes comes _____ for a cup of coffee.
Xem đáp án »
22/03/2020
16,145
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