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标题: TTGWD25-36我怎么觉得都不对啊,为什么是B? [打印本页]

作者: jessiebetty    时间: 2006-8-8 14:32
标题: TTGWD25-36我怎么觉得都不对啊,为什么是B?

Q36

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 concen-

tration 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.

我怎么觉得都不对啊,为什么是B?


作者: 顾风    时间: 2006-8-8 15:06

注意:

it is the cumulative binding of adenosine to a  large number of sites that causes the onset of sleep

Caffeine能够interfere with the binding of adenosine to sites on brain cells

所以,B是合适的


作者: gator21    时间: 2006-9-25 02:18
ding
作者: 罗马青年    时间: 2007-7-20 15:41
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[此贴子已经被作者于2007-7-20 15:57:25编辑过]

作者: 罗马青年    时间: 2007-7-20 16:04

我的理解:

 

A为:adenosineB为:sleep;

 

原文结论说的是:有A则有BA——> B

adenosine累积到大量的sites时,启动了睡眠;
                

 

选项B说:没有A就没有BA——> B
                

Caffeine,妨碍了adenosine累积(无A),因此人保持清醒(不想睡,既无B),从反面支持了原来的结论


作者: kathytc    时间: 2007-9-12 01:07
以下是引用罗马青年在2007-7-20 16:04:00的发言:

我的理解:

A为:adenosineB为:sleep;

原文结论说的是:有A则有BA——> B

adenosine累积到大量的sites时,启动了睡眠;
    

选项B说:没有A就没有BA——> B
    

Caffeine,妨碍了adenosine累积(无A),因此人保持清醒(不想睡,既无B),从反面支持了原来的结论

应该是逆否和原命题等价


作者: qianrene    时间: 2007-10-13 15:04

补充罗马GG的一个~

当adenosine积累到大量的site时候,这时就没有空间给adenosine再bind了即“During sleep, the number of sites to which adenosine is bound decreases”,所以睡眠开始

而B防碍了这个过程,就不能积累到“没位置积累而睡觉”

http://forum.chasedream.com/dispbbs.asp?boardid=24&replyid=1718237&id=181797&page=1&skin=0&Star=2其他讨论


[此贴子已经被作者于2007-10-13 15:05:05编辑过]

作者: 阿土莎莎    时间: 2007-12-3 12:29
up
作者: lichabrend    时间: 2008-5-28 00:35
up
作者: hansomecd    时间: 2008-5-28 00:41
楼上up什么目的?
作者: 初夏的味道    时间: 2009-7-21 23:39

过来看看解释


作者: skigorush    时间: 2009-7-27 20:35

作者: 路吉儿    时间: 2009-7-28 20:30

作者: qqiaoer    时间: 2010-3-13 12:31
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 thebrain, as the total amount released gradually increases during wakefulness.  随着化学物质Adenosine被脑细胞释放出来的数量在清醒时的逐步增加,A物质越来越多地绑定到大脑的某一区域

During sleep, the number of sites to which adenosine is bound decreases. 睡眠时,A物质被绑定的区域减少(我的理解是和前面那句话说的是一回事,A绑定的越来越多,所以可以给更多的A用来绑定的区域当然就少了)

Some  researchers have hypothesized that it is the cumulative binding of adenosine to a
large number of sites that causes the onset of sleep.
结论:累计的A绑定到大脑某个区域的数量达到一个大的量,这个累积的绑定就引发了睡眠。
注意:THAT从句 that causes the onset of sleep修饰限定的是binding

所以这个题目B的含义和结论要论证的方向完全一致。

其实还是阅读理解的问题,我一开始也晕。




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