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The chemical adenosine is released by brain cells when those cells are active. Adenosine then binds to more and more sites on cells in certain areas of the brain, as the total amount released gradually increases during wakefulness. During sleep, the number of sites to which adenosine is bound decreases. Some researchers have hypothesized that it is the cumulative binding of adenosine to a large number of sites that causes the onset of sleep.

Which of the following, if true, provides the most support for the researchers' hypothesis?

正确答案: B

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[原始] 10.27 逻辑JJ 考的太烂 只记得一道了

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发表于 2011-10-27 16:41:45 | 只看该作者 回帖奖励 |正序浏览 |阅读模式
PREP还是GWD上的原题

The chemical adenosine is released by brain cells when those cells are active. Adenosine then binds to more and more sites on cells in certain areas of the brain, as the total amount released gradually increases during wakefulness. During sleep, the number of sites to which adenosine is bound decreases. Some researchers have hypothesized that it is the cumulative binding of adenosine to a large number of sites that causes the onset of sleep.
Which of the following, if true, provides the most support for the researchers’ hypothesis?
A.    Even after long periods of sleep when adenosine is at its lowest concentration in the brain, the number of brain cells bound with adenosine remains very large.
B.    Caffeine, which has the effect of making people remain wakeful, is known to interfere with the binding of adenosine to sites on brain cells.
C.    Besides binding to sites in the brain, adenosine is known to be involved in biochemical reactions throughout the body.
D.    Some areas of the brain that are relatively inactive nonetheless release some adenosine.
E.    Stress resulting from a dangerous situation can preserve wakefulness even when brain levels of bound adenosine are high.选B
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22#
发表于 2011-10-28 17:17:58 | 只看该作者
谢谢LZ!逻辑寂静少啊~
我这块超烂,看了半天才看懂
21#
发表于 2011-10-28 16:38:40 | 只看该作者
thx
20#
发表于 2011-10-28 06:48:13 | 只看该作者
楼主好人!
19#
发表于 2011-10-28 06:24:20 | 只看该作者
多谢
18#
发表于 2011-10-28 02:30:00 | 只看该作者
顶,楼主好人!
17#
发表于 2011-10-28 02:26:11 | 只看该作者
谢谢楼主
16#
发表于 2011-10-28 02:20:11 | 只看该作者
表示逻辑很烂。。立马记答案。。。
15#
发表于 2011-10-28 00:31:21 | 只看该作者
选啥,B嘛?
-- by 会员 Sardaukar (2011/10/27 16:45:05)


AE都是weaken的conlusion
CD无关选项
14#
发表于 2011-10-27 23:39:15 | 只看该作者
感谢~选B
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