题目内容
16.Soundtravels (travel) through air at a speed of about 340metres per second.分析 声音在空气中的传播速度是大约每秒340米.
解答 答案:travels.声音在空气中的传播,这是一个自然现象,所以要用一般现在时.根据主语是sound,结合英语提示travel,所以要用travels.故填travels.
点评 有些自然规律的事情,要用一般现在时,首先要确定时态,然后结合给出的英语提示,就可以确定答案.
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