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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

　　正確答案：D

　　答案解析：unexpected，“沒(méi)有預(yù)見(jiàn)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。

　　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(紫外線(xiàn)) 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

　　正確答案：B

　　答案解析：從Take the case of Eta Carinae“以Eta Carinae為例”可以看出，這句話(huà)主要講的是一些關(guān)于船底星座的細(xì)節(jié)問(wèn)題。因此選擇B。

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