软件水平考试（中级）网络工程师上午（基础知识）试题模拟试卷2

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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.

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