2. 外语
  3. In the passage, the author is primarily interested in______ It can be inferred from the passage that precipitation formed from

In the passage, the author is primarily interested in______ It can be inferred from the passage that precipitation formed from

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问题 In the passage, the author is primarily interested in______
It can be inferred from the passage that precipitation formed from evaporated ocean water has______
选项 A、the same isotopic ratio as ocean water
B、less oxygen 18 than does ocean water
C、less oxygen 18 than has the ice contained in continental ice sheets
D、a different isotopic composition than has precipitation formed from water on land
E、more oxygen 16 than has precipitation formed from fresh water
答案B
解析 B is the best answer. Lines 23-27 state that when water evaporates from the ocean surface, oxygen 18, a heavier isotope than oxygen 16, tends to be left behind in the remaining ocean water. Thus, one can infer that evaporated ocean water would contain less oxygen 18 than would the remaining ocean water. A is incorrect because it contracts information stated in lines 19-27. C is incorrect because the passage suggests that the water evaporated from the ocean contributes to the growth of continental ice sheets, which should therefore have an isotopic composition similar to that of the precipitation formed from evaporated ocean water. D and E describe information that cannot be inferred from the passage.
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