The speed ______ is 340 meters per second.A、at which sound travelsB、with which

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问题 The speed ______ is 340 meters per second.

选项 A、at which sound travels
B、with which sound travels
C、of which sound travels
D、for which sound travels

答案 A

解析本题考查介词的搭配。速度前面应用介词at。句意为：声音传播的速度为每秒340米。

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Thespeed______is340meterspersecond.A、atwhichsoundtravelsB、withwhich