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根据下面的文字资料回答 71~75 题

In the following essay,each blank has fourchoices.Choose the best answer and write down on thean,swer sheet.

Microwave communication uses( 1 )frequency radio waves that travel instraighdine sthroughthe air.Because the waves cannot( 2 )with the curvature of the earth,they can be ( 3 )onlyover short distance.Thus,microwave is a good( 4 )for sending data between bulldingsin a city or on a large college campus.For longer distances,the waves must berelayed by means of“dishes”or( 5 ).These can be installed on towers,highbuildings,and mountain tops.

第71题:文中( 1 )处正确的答案是(  )。

  • A.high
  • B.10w
  • C.1ong
  • D.short
参考答案
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第75题:文中( 5 )处正确的答案是(  )。

  • A.repeaters
  • B.radars
  • C.telephones
  • D.antennas

第73题:文中( 3 )处正确的答案是(  )。

  • A.transmitted
  • B.transformed
  • C.converted
  • D.delivered

第68题:文中( 3 )处正确的答案是(  )。

  • A.The hub
  • B.The bridge
  • C.The router
  • D.The proxy
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