【CR-4-考古】原题啊大家~~COME ON~~

shenqi45678

啊，今儿是一个丰收的日子~~~在此，LZ替SH兄贴此CR考古一枚（做好事不留名的人啊~~）

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.

答案B。
这是原文的讨论链接
http://gmatclub.com/forum/chemical-adenosine-81518.html

taomicke

顶一个~~ ！

XYXB

这个。。。。不是N久前就汇总进Cr了嘛

shenqi45678

这个。。。。不是N久前就汇总进Cr了嘛

-- by 会员 XYXB (2011/11/7 16:24:20)

是吗，我错了=。=

XYXB

这个。。。。不是N久前就汇总进Cr了嘛

-- by 会员 XYXB (2011/11/7 16:24:20)

是吗，我错了=。=

-- by 会员 shenqi45678 (2011/11/7 16:34:54)

没事没事，谢谢分享！

shenqi45678

这个。。。。不是N久前就汇总进Cr了嘛

-- by 会员 XYXB (2011/11/7 16:24:20)

是吗，我错了=。=

-- by 会员 shenqi45678 (2011/11/7 16:34:54)

没事没事，谢谢分享！

-- by 会员 XYXB (2011/11/7 16:41:39)

嘿嘿，谢谢奥特曼GG的回复~~嘿~

XYXB

这个。。。。不是N久前就汇总进Cr了嘛

-- by 会员 XYXB (2011/11/7 16:24:20)

是吗，我错了=。=

-- by 会员 shenqi45678 (2011/11/7 16:34:54)

没事没事，谢谢分享！

-- by 会员 XYXB (2011/11/7 16:41:39)

嘿嘿，谢谢奥特曼GG的回复~~嘿~

-- by 会员 shenqi45678 (2011/11/7 16:47:41)

不是G，是姐。。。。。。。。。。。

Sardaukar

LZ OUT了。。。。。不过谢谢好心了！

与秋vicky

看JJ的时候正好漏了，话说之前还做到过的说，谢谢LZ
看楼主跟版主的对话让我大晚上的乐了~~~

蓝若痕

这个。。。。不是N久前就汇总进Cr了嘛

-- by 会员 XYXB (2011/11/7 16:24:20)

是吗，我错了=。=

-- by 会员 shenqi45678 (2011/11/7 16:34:54)

没事没事，谢谢分享！

-- by 会员 XYXB (2011/11/7 16:41:39)

嘿嘿，谢谢奥特曼GG的回复~~嘿~

-- by 会员 shenqi45678 (2011/11/7 16:47:41)

不是G，是姐。。。。。。。。。。。

-- by 会员 XYXB (2011/11/7 16:49:23)

特特特好奇凹凸曼姐姐的身份啊~~~