The troposphere is the warmest part of the atmosphere because it _____ .

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• 1Studies in the stratosphere have been made possible by _____ .

  A.weather balloons

  B.meteorologists

  C.jet planes

  D.earth satellits

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• 2The title below that best expresses the ideas of this passage is _____ .

  A.The Makeup of the Atmosphere

  B.Studying the Atmosphere

  C.Atmosphere and Weather

  D.Temperature in the Stratosphere

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• 3The author of this article is _____ .

  A.merely attempting to be humorous

  B.revealing his low opinion of mankind

  C.expressing his doubts about the possibility of breeding a superape

  D.presenting a plausible theory in a humorous tone

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• 4The author states that a supply of nonhuman workers for low IQ jobs world _____ .

  A.upset the nation′s economy

  B.benefit man mentally and physically

  C.be a disadvantage to many human workers

  D.enrage the Society for Prevention of Cruelty to Animals

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• 5In the author′s opinion, the idea that geneticists could produce a superape is _____ .

  A.a strain on the imagination

  B.demonstrably true

  C.plausibl(似合理的)

  D.biologically impossible

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• 6Studies of the atmosphere may reveal _____ .

  A.the secrets of life

  B.its true effect upon the earth's weather

  C.the source of the sun's energy

  D.how to control ultraviolet rays

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• 7By diverting some or all of the money spent on preparations for war to peaceful purposes, all of the following benefits would occur EXCEPT _____ .

  A.taxes would be reduced

  B.education could be improved

  C.the population explosion could be controlled

  D.better housing could be provided

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• 8Schools at the present time often have to make use of _____ .

  A.inadequaie funds

  B.untrained teachers

  C.poor buildings

  D.lies in order to promote hatred of possible enemies

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• 9The problem of undernourishment will become more critical because _____ .

  A.America destroys its surplus goods

  B.there is inadequate shipping

  C.of the population explosion

  D.of lack of irrigation

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• 10The adjective that best describes this author is _____ .

  A.humorous

  B.realistic

  C.utopian

  D.radical

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