OG-RC-50. 2. The author of the passage would be most likely to agree with which of the following statements about the Milankovitch theory? (A) It is the only possible explanation for the ice ages. (B) It is too limited to provide a plausible explanation for the ice ages, despite recent research findings. (C) It cannot be tested and confirmed until further research on volcanic activity is done. (D) It is one plausible explanation, though not the only one, for the ice ages. (E) It is not a plausible explanation for the ice ages, although it has opened up promising possibilities for future research. Explanation: D is the best answer. In lines 9-16, the author states that a recent discovery has made it possible to establish a precise chronology of the Earth’s ice ages. Scientists have used this discovery to test the basic premise of Milankovitch’s theory—that the ice ages were caused by variations in the Earth’s orbit around the Sun. The author notes in lines 53-56 that the data have established a “strong connection” between orbital variation and ice ages, which confirms the plausibility of Milankovitch’s theory. However, one can infer from the last paragraph that the author believes factors other than variations in the Earth’s orbit could provide plausible explanations for global climate change.
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发表于 2003-5-14 06:34:00
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