2. 外语
  3. The primary purpose of the passage is to______ Snyder et al suggest that caffeine’s ability to bind to A1 and A2 receptors can

The primary purpose of the passage is to______ Snyder et al suggest that caffeine’s ability to bind to A1 and A2 receptors can

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问题 The primary purpose of the passage is to______
Snyder et al suggest that caffeine’s ability to bind to A1 and A2 receptors can be at least partially attributed to which of the following?
选项 A、The chemical relationship between caffeine and phosphodiesterase
B、The structural relationship between caffeine and adenosine
C、The structural similarity between caffeine and neurotransmitters
D、The ability of caffeine to stimulate behavior
E、The natural occurrence of caffeine and adenosine in the brain
答案B
解析 B is the best answer. This question asks you to identify information that is suggested rather than directly stated in the passage. To answer it, first look for the location in the passage of the information specified in the question. The A1 and A2 receptors are mentioned in lines 23-26. Lines 27-35 go on to describe Snyder et al’s hypothesis about the effects of caffeine on behavior. They propose that caffeine, “which is structurally similar to adenosine,” is able to bind to A1 and A2 receptors in the brain, the same receptors that adenosine normally binds to. Thus, the passage suggests that the structural relationship between caffeine and adenosine may be partially responsible for caffeine’s ability to bind to A1 and A2 receptors.
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