单项选择题

Sound travels in the form (形式) of ______.

A．bones
B．air
C．waves
<上一题 目录 下一题>
热门 试题

单项选择题
People in the village looked after the tree very carefully.
A．Right.
B．Wrong.
C．Doesn't say.
单项选择题
That day it rained heavily.
A．Right.
B．Wrong.
C．Doesn't say.
相关试题