Câu hỏi:
13/03/2020 873Read 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.
According to the passage, when did sea level significantly rise?
Đáp án chính xác
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Trả lời:
Giải bởi Vietjack
Đáp án A
To describe feature of the undersea world.
Mục đích chính của đoạn văn này là gì
Thông tin nằm ở đoạn 1: “In addition to the great ridges and volcanic chains, the oceans conceal another form of undersea mountains: the strange guyot, or flat-topped seamount.” Ngoài những dãy núi lớn và những ngọn núi lửa, đại dương cũng che dấu một hình thức khác của núi: đó là các guyot, hay gọi là núi ngầm dưới nước có đỉnh bằng
Câu này là câu mở của đoạn để giới thiệu mục đích chính sau đó của cả đoạn văn sẽ là mô tả đặc điểm của thế giới dưới biển.
Các phương án khác không phải là mục đích chính của bài. B. để lần theo nghề nghiệp của ông Amold Guyot. C. để trình bày các kết quả của nghiên cứu địa chất gần đây. D. để thảo luận về các dãy núi dưới nước và núi lửa.
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.
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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.
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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?”
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Câu 7:
The man who lives opposite us sometimes comes _____ for a cup of coffee.
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