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?
AA 一个市长在任的时候失业率低 人口增长了 另一个市长在任的时候失业率高 人口降低了 所以人们应该再选回前一个市长 AI people are more likely to accept a leader who has demonstrated the ablity that he or she orders others to do.
逻辑 LZ最不好的是逻辑 花的时间比较长 遇到了BF 第一句是提出一个arguement 第二句是assessment那个 还遇到了 就是建房那个JJ72 但是问的是since 句子填空 但是大意一样 还有那个 会不会引用别人作品的那题 还有GWD原题 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 thebrain, as the total amount released gradually increases during wakefulness.During sleep, the number of sites to which adenosine is bound decreases. Someresearchers have hypothesized that it is the cumulative binding of adenosine toa 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 itslowest concentration in the brain, the number of brain cells bound withadenosine remains very large. B. Caffeine, which has the effect of making people remainwakeful, is known to interfere with the binding of adenosine to sites on braincells. C. Besides binding to sites in the brain, adenosine is knownto be involved in biochemical reactions throughout the body. D. Some areas of the brain that are relatively inactivenonetheless release some adenosine. E. Stress resulting from a dangerous situation can preservewakefulness even when brain levels of bound adenosine are high. 答案是B