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.    41    kind of sleep is at all well-understood, but REM sleep is   42   to serve some restorative function of the brain. The purpose of non-REM sleep is even more   43  . The new experiments, such as these   44   for the first time at a recent meeting of the Society for Sleep Research in Minneapolis, suggest fascinating explanations   45   of non-REM sleep.

For example, it has long been known that total sleep   46   is 100 percent fatal to rats, yet,   47   examination of the dead bodies, the animals look completely normal. A research has now   48   the mystery of why the animals die. The rats   49   bacterial infections of the blood,   50   their immune systems-the self-protecting mechanism against diseases-had crashed.

 

41. [A] Either     [B] Neither        [C] Each   [D] Any
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