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GRE模拟题:自测试题二(4)

留学快车整理  08-06-19 00:00:00 责任编辑:王立 我要评论 选校
11.The early universe contained only the lightest

  elements, hydrogen and helium. Heavier elements,

  such as carbon, form only in nuclear reactions in

  stars and are dispersed when the stars explode. A

  recently discovered gas cloud contained carbon

  several billion years ago, when the universe was

  no more than two billion years old.

  If the statements above are true, which of the

  following must, on the basis of them, also be true?

  (A)The earliest stars contained only hydrogen.

  (B)Some stars were formed before the universe was

  two billion years old.

  (C)The carbon in the gas cloud later formed part of

  some stars.

  (D)No stars identified to date are as old as the gas

  cloud.

  (E)The gas cloud also contained hydrogen and

  helium.

  12.Sleep deprivation is a known cause of workplace

  error, and many physicians frequently go without

  sleep for periods of 24 hours or more. However, few

  of these physicians have, in the course of a routine

  examination by a peer, been diagnosed with sleep

  deprivation.So there is little cause for concern that

  habitual sleep deprivation will cause widespread

  physician error.

  The answer to which of the following questions

  would be most helpful in evaluating the argument?

  (A)Do physicians who have been diagnosed with

  sleep disorders also show signs of other ills not

  related to sleep deprivation?

  (B)Is the ability to recognize the symptoms of sleep

  deprivation in others significantly impaired by

  habitual sleep deprivation?

  (C)Do factors other than habitual sleep deprivation

  ever lead to errors in the workplace on the part

  of physicians?

  (D)Of people who have recently been treated by

  physicians, what percentage believe that many

  physicians have occasionally suffered from sleep

  deprivation?

  (E)Is the incidence of sleep deprivation higher

  among physicians than it is among other health

  care workers?

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