Chủ nhật, 22/12/2024
IMG-LOGO

Câu hỏi:

23/07/2024 411

Read 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?

A. To describe feature of the undersea world.

Đáp án chính xác

B. To trace the career of Arnold Guyot.

C. To present the results of recent geologic research.

D. To discuss underwater ridges and volcano chains.

Trả lời:

verified 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

Câu trả lời này có hữu ích không?

0

CÂU HỎI HOT CÙNG CHỦ ĐỀ

Câu 1:

All his plans for starting his own business fell _____.

Xem đáp án » 18/06/2021 2,346

Câu 2:

My brother had his camera _____ from his car in the office car-park.

Xem đáp án » 18/06/2021 2,162

Câu 3:

This statue is a lifelike _____ of Christ Jesus.

Xem đáp án » 18/06/2021 1,842

Câu 4:

The man who lives opposite us sometimes comes _____ for a cup of coffee.

Xem đáp án » 18/06/2021 1,650

Câu 5:

A : Do you mind if we schedule the meeting for 11 o’clock?

B : Well, actually, I _____ earlier.

Xem đáp án » 18/06/2021 1,629

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.
“You shouldn’t sit up until you feel better.” the doctor said to me.

Xem đáp án » 18/06/2021 1,551

Câu 7:

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 » 18/06/2021 1,550

Câu 8:

He will do the work and then send you the _____ for it.

Xem đáp án » 18/06/2021 1,517

Câu 9:

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 girl has a bazillion clothes already, she does not need to buy any more.

Xem đáp án » 18/06/2021 1,517

Câu 10:

Floods have completely _____ the farmer’s crops.

Xem đáp án » 18/06/2021 1,487

Câu 11:

I had a_____, which I couldn’t explain, that something terrible was going to happen.

Xem đáp án » 18/06/2021 1,343

Câu 12:

– Customer: “Can I have a look at that pullover, please?”
– Salesgirl: “_____.”

Xem đáp án » 18/06/2021 1,339

Câu 13:

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 » 18/06/2021 1,263

Câu 14:

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.
We spray pesticides and fertilizers on our crops. Some pesticides and fertilizers are found dangerous.

Xem đáp án » 18/06/2021 1,198

Câu 15:

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 » 18/06/2021 1,192

Câu hỏi mới nhất

Xem thêm »
Xem thêm »