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题目内容 (请给出正确答案)
单选题
Which of the following can serve as the best title of this passage?
A

The Prefix Mach.

B

The Speed of Sound.

C

The Frequency of Sound.

D

The Intensity of Sound.


参考答案

参考解析
解析:
主旨题。文章首段介绍了测声速的方法,第二段就介绍了声音的产生和频率,第三段介绍了声音的强度,第四度介绍了不同介质中声速不同。综合全文,选项B“声速”概括了文章的全部内容,因此是最佳选择。其余三项只涉及文中的一部分内容,都不宜作为文章的标题。
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