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自考《英语（一）》真题练习：概括大意（4.07）

单选题

1.【概括大意】Radar is now a familiar tool. Like many others it was an unexpected discovery. It was first observed by two researchers,who were studying sound communication. They were sending signals from a station on one side of a river in Washington D to a vehicle across the river. They discovered that their signals were stopped by passing ships. They recognized the importance of this discovery at once.

The main idea of this paragraph is__________.

A.Study of Radar

B.Radar is now a familiar tool

C.Radar Working Principles

D.Radar was Discovered by Chance

正确答案：D

答案解析：unexpected，“没有预见到的”，等于答案D中的by chance“偶然间的”。这道题用到了同义词替换这一解题方法。

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