单项选择题

What is the meaning of the underlined word "waterproof" in the third paragraph

A．Covered with water.
B．Full of water.
C．Cleaned by water.
D．Not allowing water to go through.
<上一题 目录 下一题>
热门 试题

单项选择题
Pollution in water is noticed______.
A．when poisons are poured into water
B．when a great many fish and birds die
C．when the first organisms are affected
D．as soon as the balance of nature is destroyed
单项选择题
The way to stop water pollution is______.
A．to put oxygen into the river
B．to realize the serious situation clearly
C．to make the waste materials harmless
D．to make special room in the sea for our waste
相关试题