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


  1. A.
    over; in
  2. B.
    through; at
  3. C.
    by; at
  4. D.
    through; over
B
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,習慣用法也很多,有時很難從詞義上區(qū)分開來。故學(xué)習中要注意不斷總結(jié),熟記一些介詞和動詞的固定搭配用法及習慣用法,是完成此類問題的捷徑。
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