写作：六级四十天突破—讲义与笔记（26）
总分总结构举例
Cloze Test 3
Sleep is divided into periods of so-called REM sleep, characterized by rapid eye movements and dreaming, and longer periods of non-REM sleep.
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kind of sleep is at all well-understood, but REM sleep is
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to serve some restorative function of the brain. The purpose of non-REM sleep is even more
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. The new experiments, such as these
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for the first time at a recent meeting of the Society for Sleep Research in
For example, it has long been known that total sleep
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is 100 percent fatal to rats, yet,
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examination of the dead bodies, the animals look completely normal. A research has now
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the mystery of why the animals die. The rats
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bacterial infections of the blood,
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their immune systems-the self-protecting mechanism against diseases-had crashed.
42. [A] intended [B] required [C] assumed [D] inferred
43. [A] subtle [B] obvious [C] mysterious [D] doubtful
44. [A] maintained [B] described [C] settled [D] afforded
45. [A] in the light [B] by virtue [C] with the exception [D] for the purpose
46. [A] reduction [B] destruction [C] deprivation [D] restriction
47. [A] upon [B] by [C] through [D] with
48. [A] paid attention to [B] caught sight of [C] laid emphasis on [D] cast light on
49. [A] develop [B] produce [C] stimulate [D] induce
50. [A] if [B] as if [C] only if [D] if only
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