理工類-概括大意（1月23日）_職稱英語網(wǎng)校

概括大意與完成句子

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 DC. 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

【正確答案】 D

【答案解析】 unexpected，“沒有預(yù)見到的”，等于答案D中的by chance“偶然間的”。這道題用到了同義詞替換這一解題方法。

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