单项选择题

Questions 19 to 21 are based on the passage you have just heard.

A．Because the world is becoming more and more noisy.
B．Because they have learned that noise is also a kind of pollution.
C．Because noise is an unwanted waste for human beings.
D．Because people knew little about noise before.
<上一题 目录 下一题>
热门 试题

单项选择题
A．The captain.B．The communications officer.C．The doctor.D．The frog people.
A．The captain.
B．The communications officer.
C．The doctor.
D．The frog people.
单项选择题
A．If he swallows dry bread easily.B．If he eats a lot of dry bread.C．If he drinks milk or hot water.D．If he could hardly swallow dry bread.
A．If he swallows dry bread easily.
B．If he eats a lot of dry bread.
C．If he drinks milk or hot water.
D．If he could hardly swallow dry bread.
相关试题