Water is a good ______ for transmitting sound.

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问题 Water is a good ______ for transmitting sound.

选项 A、medium
B、media
C、median
D、mediate

答案A

解析 medium:媒介,单数形式;media:媒体,复数形式,median:中部、中间;mediate:居中调停。因此正确答案是A。
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