Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of the questions from 36 to 42.
A rather surprising geographical feature of Antarctica is that a huge freshwater, 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 warned by geothermal heat from the earth's core. This thick glacier above Lake Vostok actually insulates it from frigid temperatures (the lowest ever recorded on Earth) 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; 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 fresh water 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 purpose of the passage is to ________.
A. explain how Lake Vostok was discovered
B. provide satellite data concerning Antarctica
C. discuss future plans for Lake Vostok
D. present an unexpected aspect of Antarctica's geography
Đáp án D
Dịch nghĩa: Mục đích của bài viế là để _________.
A. giải thích hồ Vostok được phát hiện như thế nào
B. cung cấp những dữ liệu vệ tinh về Nam Cực
C. bàn luận kế hoạch tương lai cho hồ Vostok
D. trình bày một phương diện không thể ngờ tới của địa lý Nam Cực.
Giải thích: Ngay câu mở đầu bài viết đã giới thiệu về một đặc điểm đáng ngạc nhiên của vùng Nam cực. Trong khi đó, phương án A chỉ được nhắc đến trong đoạn 2, phương án B không có, bài văn không đưa ra dữ liệu cụ thể nào cả, phương án C kế hoạch tương lai chỉ được gợi nhắc ở đoạn 3 mà không phải bàn luận, cũng quá chi tiết, không thể hiện được nội dung chính của cả bài như D.