28日寂静，找到一个洛基原题

gavensc

狗主人：
讲大脑分泌一种神马物质能够binding到一个神马细胞之类的东西上，binding多了人就会weakness，然后就想睡觉，说睡完了就binding少了，然后有人就说什么binding是sleep的原因，问支持？狗爸选的是咖啡能够减少binding，从而起到不让人想睡觉的目的


36. GWD25-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 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.

答案选b

gavensc

请求确认。

season777

谢谢！

cloverfield

嗯~我也觉得是这个题~

sarahstany

agree

northface

这题感觉挺难的。。