请教GWD25-Q36

bdx2010

GWD25-Q36（答案是B，没咋看明白，请NN来给看看，非常感谢~~

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.

overthere33

这题其实很简单 结论是AD大量附着在某个位置（因）就导致睡眠的开始（果）

B 说 咖啡因阻止AD的附着（异因） 让人睡不着觉 （异果） 这不正好加强吗