1995年全国硕士研究生入学考试英语试题及参考答案

Part Two:

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 1OO percent fatal to rats, yet ,47 exanlination of the dead bodies , the animals look completely normal . A researcher has now 48 the mystery of why the aninlals 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)Ndther (C)Each tn)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 tc)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