In today’s world,almost everyone knows air pollution and wat

In today’s world,almost everyone knows air pollution and water pollution.But not all the persons know that noise is also a kind of pollution.In fact,noise pollution is harmful(有害的) to human health,too.
People usually have poorer hearing if they work and under noisy conditions.Recenttly many teenagers in Americia can hear no better than 65-year-old people,for these people like to listen to pop music.and most of the music is an kind of noise.Many people living near airports becomes deaf.(聋的).Noise produced（产生） by jet-planes（喷气式飞机） or machines will make people’s life difficult and unpleasant,or even make people’s ill,or even drive them mad.
Nowdays the governments (政府)of many countries are trying to solve not only air and water pollution problems but also noise pollution problem.
6． ______ is a kind of pollutions.
A．Water　　B．Air C．Noise　D．Pop music
7． ______.usually have poor hearing.
A．People listening to pop music.
B．People living near airports.
C．People walk in the street.
D．People living in foreign countries.
8．The governments (政府)of many countries are trying to solve ______.
A．water pollution　　B．air pollution C．noise pollution　D．all of the above
9．Many people living near airports becomes deaf,because of _____.
A．air pollution　　B．water pollution C．noise pollution　D．music pollution
10.Many teenagers like to listen to _____.
A．noise　B．pop music C．classical muisc　D．jazz

6.C
7.A
8.C
9.C
10.B
再问： 第2题到底选什么啊 拜托看一下
再答： A吧，是指听力下降。没B的后果严重。