2. 外语
  3. The speed ______ is 340 meters per second.

The speed ______ is 340 meters per second.

admin2014-03-13  87
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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