Sound travels ______ air ______ a speed of about 340 metres per second.

A．over; in           B．through; at         C．by; at             D．through; over

 

【答案】

B

【解析】

試題分析：over越過，在……之上；in在里面；through通過；at在一點；by通過某種方式，到……為止。句意：聲音在空氣中的傳播速度大約是每秒340米。結(jié)合語境可知前文是通過空氣的速度，下文表示在數(shù)字上的一點，故前一空用through，后一空用at，選B。

考點：介詞辨析

點評：英語介詞的一個特點是一詞多義，并且介詞間語義交叉現(xiàn)象很多，習(xí)慣用法也很多，有時很難從詞義上區(qū)分開來。故學(xué)習(xí)中要注意不斷總結(jié)，熟記一些介詞和動詞的固定搭配用法及習(xí)慣用法，是完成此類問題的捷徑。

 

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