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

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• 1The 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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• 2In 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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• 3The 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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• 4All the following were seen as advantages of the postage stamp EXCEPT that .

  A.it had to be purchased by the sender in advance

  B.it increased the cost of mail delivery

  C.it was difficult to affix to letters

  D.is was easy to counterfeit

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• 5The passage mainly discusses .

  A.the increased use of private mail services

  B.the development of a government postal system

  C.a comparison of urban and rural postal services

  D.the history of postage stamps

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• 6At 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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• 7Studies in the stratosphere have been made possible by .

  A.meteorologists

  B.jet planes

  C.earth satellites

  D.study of jet streams

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• 8Life 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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• 9The 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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• 10What 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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