高二英語閱讀專項練習題原文：

　　Since the radio waves were used to tell the direction in which to send the RAF planes and the distance to send them(their line of flight, in other words), the device was called radio direction and ranging, and from the initials the word radar was invented.

　　高二英語閱讀專項練習題：

　　1. Sound waves reflected from a hill can be used to calculate the _____.

　　A. height of the hill

　　B. speed of sound

　　C. distance to the hill

　　D. intensity of sound

　　2. Radar enabled the English to ______.

　　A. prevent German planes being on their may to London

　　B. direct the outnumbered RAF planes effectively

　　C. confuse German bomber pilots

　　D. number the Royal Air Force

　　3. The British used radio waves because they ______.

　　A. were more exact than sound waves

　　B. could not be detected

　　C. were more useful that sound waves

　　D. were easier to use than sound waves

　　4. The author of this article probably intended to explain ______.

　　A. exactly how radar works

　　B. why the British used radio waves in their device

　　C. How radar (word and device) Came to be

　　D. How radar helped the British win the Battle of Britain

　　高二英語閱讀專項練習題答案：

　　CBCC

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