本月jj上一道题，我怎么觉得应该选A？

yycome

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.

答案是B，哪位nn给解释下？

MyrticeTAN

原文是说：人醒着的时候或者是慢慢要醒来的时候，adenosine这个东西就和大脑某特定部位的细胞结合得越来越多，而人在睡觉的时候，结合就少

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.
这个其实是削弱，因为如果按原文的推理过程，那么睡觉时应该是结合少，而不是 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.
这个加强，相当于异因异果
咖啡有提神作用，作用机制是影响adenosine和cell的结合，（但其实我觉得这里interfere with的理解对解题很有影响呃……可能这里不是作阻碍的意思，应该是影响的意思，因为咖啡其实是要增多他们的结合）那么人就不会困了

我是这样理解的……

yycome

谢谢你！！
我貌似有点明白了。人在清醒的时候adenosine不断积累，结论是当大脑特定区域结合了大量的sites时人会产生睡眠。如果caffeine阻止结合，这样就可以阻止睡眠，正好解释了文中的结论