2. 医学
  3. Sleep is divided into periods of so-called REM sleep, characterized by rapid eye movements and dreaming, and longer periods of n

Sleep is divided into periods of so-called REM sleep, characterized by rapid eye movements and dreaming, and longer periods of n

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问题     Sleep is divided into periods of so-called REM sleep, characterized by rapid eye movements and dreaming, and longer periods of non-REM sleep.【C1】______ kind of sleep is at all well-understood, but REM sleep is【C2】______ to serve some restorative function of the brain. The purpose of non-REM sleep is even more【C3】______ . The new experiments, such as those【C4】______ for the first time at a recent meeting of the Society for Sleep Research in Minneapolis, suggest fascinating explanations【C5】______ of non-REM sleep.
    For example, it has long been known that total sleep【C6】______ is 100 percent fatal to rats, yet,【C7】______ examination of the dead bodies, the animals look completely normal. A researcher has now【C8】______ the mystery of why the animals die. The rats【C9】______ bacterial infections of the blood,【C10】______ their immune systems—the self-protecting mechanism against disease—had crashed.
【C5】
选项 A、in the light
B、by virtue
C、with the exception
D、for the purpose
答案D
解析 本题考查介词短语辨析。各选项意为：in the light of“按照，根据”：by virtue of“由于”；with the exception“除了”；for the purpose of“为了……目的”。根据上下文，此处应该是对非REM睡眠的惊人作用进行解释，故选D。
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