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　　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。

　　2、

　　[概括大意]Take the case of Eta Carinae， one of the most explosive stars in the universe. This star produces ultraviolet laser rays(紫外线) and it will destroy itself in a few million years‘ time. It is five times brighter than the sun and when it explodes it is going to be a sight worth waiting for!

　　The main idea of this paragraph is__________.

　　A、Power of the telescope

　　B、Details of Eta Carinae

　　C、Invention of a time machine

　　D、Biggest telescope

　　正确答案：B

　　答案解析：从Take the case of Eta Carinae“以Eta Carinae为例”可以看出，这句话主要讲的是一些关于船底星座的细节问题。因此选择B。

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