Studies in the stratosphere have been made possible by .

试卷相关题目

• 1At the top of Jungfrau, which towers 12,000 feet above the town of Interlaken in Switzerland, the temperature is usually .

  A.below freezing

  B.about 42 degrees colder than on the ground

  C.warmer than in Interlaken

  D.about 75 degrees colder than in Interlaken

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• 2A jet plane will usually have its best average rate of speed on its run from .

  A.New York to San Francisco

  B.Los Angeles to New York

  C.Beijing to Singapore

  D.Sydney to Tokyo

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• 3The private postal services of the 19th century claimed that they could do which of the following better than government、

  A.Deliver a higher volume of mail.

  B.Deliver mail more cheaply.

  C.Deliver mail faster.

  D.Deliver mail to rural areas.

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• 4In 1863 the United States government began providing which of the following to mail carriers、

  A.A salary.

  B.Transportation.

  C.Housing.

  D.Free postage stamps.

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• 5The author mentions the city of Philadelphia (par

  A.2) because .A.it was the site of the first post office in the United Stated

  B.its postal service was inadequate for its population

  C.it was the largest city in the United States in 1847

  D.it was commemorated by the first United States postage stamp

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• 6Life as we know it exists on the earth because the atmosphere .

  A.contains a layer of ozone gases

  B.contains electrically charged particles

  C.is warmest at the bottom

  D.carries the ultraviolet rays of the sun

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• 7The 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.The Sun’s Rays

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• 8What was the purpose of Summer’s visit、

  A.To bring information from the management.

  B.To check the efficiency of the workers.

  C.To find out the attitude of the workers.

  D.To examine the machinery at the factory.

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• 9What was the narrator’s reaction to the proposed visit、

  A.He thought it would be a waste of his time.

  B.He was pleased to have something different to do.

  C.He was happy to assist the management.

  D.He thought it would cause troubl

  E.

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• 10When Summer arrived, Sid’s behaviour was .

  A.hostile

  B.polite

  C.nervous

  D.indifferent

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