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  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.
【C2】
选项 A、intended
B、required
C、assumed
D、inferred
答案C
解析 本题考查动词词义辨析。根据上下文推断，上句说无论是哪种睡眠都不易于理解，所以此处说REM睡眠具有有助于大脑恢复功能的说法应该不是肯定的，而是猜测的。人们主观上认为它具备这功能，虽然D选项infer意为“根据事实的推测、推断”，但其后一般接从句。而assume sth．／sb．to do符合题意，故选C。
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