Câu hỏi:
18/03/2020 2,508Read 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 28 to 34.
A rather surprising geographical feature of Antarctica is that a huge freshwater lake, one of the world's largest and deepest, lies hidden there under four kilometers of ice. Now known as Lake Vostok, this huge body of water is located under the ice block that comprises Antarctica. The lake is able to exist in its unfrozen state beneath this block of ice because its waters are warmed by geothermal heat from the earth's core. The thick glacier above Lake Vostok actually insulates it from the frigid temperatures on the surface.
The lake was first discovered in the 1970s while a research team was conducting an aerial survey of the area. Radio waves from the survey equipment penetrated the ice and revealed a body of water of indeterminate size. It was not until much more recently that data collected by satellite made scientists aware of the tremendous size of the lake; the satellite-borne radar detected an extremely flat region where the ice remains level because it is floating on the water of the lake.
The discovery of such a huge freshwater lake trapped under Antarctica is of interest to the scientific community because of the potential that the lake contains ancient microbes that have survived for thousands upon thousands of years, unaffected by factors such as nuclear fallout and elevated ultraviolet light that have affected organisms in more exposed areas. The downside of the discovery, however, lies in the difficulty of conducting research on the lake in such a harsh climate and in the problems associated with obtaining uncontaminated samples from the lake without actually exposing the lake to contamination. Scientists are looking for possible ways to accomplish this.
The last paragraph suggests that scientists should be aware of __________.
Đáp án chính xác
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Trả lời:
Giải bởi Vietjack
Đáp án C.
Key words: last paragraph, scientists, aware
Clue: conducting research ... without actually exposing the lake to contamination - tiến hành nghiên cứu ... mà không làm tổn hại đến hồ
A. further discoveries on the surface of Antarctica: khám phá nhiều hơn bề mặt của Nam Cực
B. problems with satellite-bome radar equipment: những vấn đề với thiết bị rada vệ tinh
C. ways to study Lake Vostok without contaminating it: phương pháp nghiên cứu hồ Vostok mà không làm tổn hại đến hồ
D. the harsh climate of Antarctica: khí hậu khắc nghiệt của Nam Cực
Đáp án chính xác là đáp án C.
Nhà sách VIETJACK:
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