
视频解析
文字解析
Inference
>The author suggests throughout the passage that recently reported amphibian extinctions may have several different causes: they may be due to any number of chance events, for example, or may simply be the result of a small population that finds itself unable to
continue under difficult conditions, whatever causes those conditions.
A.The author states in the second paragraph that extinctions may occur without a proximate cause in human activities and does not make a commitment to any particular explanation of the amphibian extinctions.
B.That chance events can cause extinctions suggests that even if habitats had been protected, extinctions still might have occurred.
C.In the second paragraph, the author says that extinctions should come as no great surprise, but this option is imprecise. The amphibian populations have not generally been declining for a number of years. The author says in the third paragraph that amphibian populations show strong fluctuations; further, in the fourth paragraph, the author says that there is insufficient long-term data to conclude that amphibian populations have been, or are, in decline.
D.The author suggests that the extinctions may have been caused by chance events, but there is not enough data to know whether or not this is probable.
E.Correct. The reported extinctions could have resulted from several different causes; thus, they are not clear evidence of general environmental degradation.
The correct answer is E.

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