Section II: Close Test

Directions:

For each numbered blank in following passage, there are four choices marked [A], [B], [C] and [D]. Choose the best one and mark your answer on ANSWER SHEET 1 by blackening the corresponding letter in the brackets with a pencil. (10 points)

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 researcher 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 disease -- had crashed.

41.   [A] Either

[B] Neither

[C] Each（B）

[D] Any

42.   [A] intended

[B] required

[C] assumed（C）

[D] inferred

43.   [A] subtle

[B] obvious

[C] mysterious（C）

[D] doubtful

44.   [A] maintained

[B] described

[C] settled（B）

[D] afforded

45.   [A] in the light

[B] by virtue

[C] with the exception（D）

[D] for the purpose

46.   [A] reduction

[B] destruction

[C] deprivation（C）

[D] restriction

47.   [A] upon

[B] by

[C] through（A）

[D] with

48.   [A] paid attention to

[B] caught sight of

[C] laid emphasis on（D）

[D] cast light on

49.   [A] develop

[B] produce

[C] stimulate（A）

[D] induce

50.   [A] if

[B] as if

[C] only if（B）

[D] if only

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