2. 外语
  3. The primary purpose of the passage is to______ The author quotes Snyder et al in lines 38-43 most probably in order to______

The primary purpose of the passage is to______ The author quotes Snyder et al in lines 38-43 most probably in order to______

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问题 The primary purpose of the passage is to______
The author quotes Snyder et al in lines 38-43 most probably in order to______
选项 A、reveal some of the assumptions underlying their theory
B、summarize a major finding of their experiments
C、point out that their experiments were limited to the mouse
D、indicate that their experiments resulted only in general correlations
E、refute the objections made by supporters of the older theory
答案B
解析 B is the best answer. This question asks you to identify the function of a quotation in the third paragraph of the passage. The third paragraph provides evidence for Snyder et al’s hypothesis by discussing experiments they conducted on mice. The quotation in lines 74-84 “summarizes” the findings of these experiments. Snyder et al found that a number of caffeine derivatives are able to bind to specific receptors in the brains of mice just as adenosine does, and that the derivatives that are most successful at stimulating locomotion are also the most successful in competing with adenosine in binding at the receptors. This finding is “major” in that it supports their hypothesis that the simulative effects of caffeine are a result of its ability to compete with adenosine.
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