2. 计算机
  3. In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet. Microwave com

In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet. Microwave com

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问题 In the following essay, each blank has four choices. Choose the best answer and write-down on the answer sheet.
   Microwave communication uses high-frequency(71)waves that travel in straightlines through the air. Because the waves cannot(72)with the curvature of the earth, they can be(73)only over short distance. Thus, microwave is a good(74)for sending data between buildings in a city or on a large college campus. For longer distances, the waves  must be relayed by means of "dishes" or(75). These can be installed on towers, highbuildings, and mountain tops.
选项 A、optical
B、radio
C、electrical
D、magnetic
答案B
解析
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