19、The world itself is becoming much smaller by using modem traffic and modem communication means(通訊設(shè)備)．Life today is much easier than it was hundreds of years ago, but it has brought new problems．One of the biggest problems is pollution．To pollute means to make things dirty．Pollution comes in many ways．We see it, smell it, drink it and even hear it．

Man has polluted the earth．The more people, the more pollution．

Air pollution is still the most serious．It’s bad for all living things in the world, but it is not the only kind of pollution．Water pollution kills fish and pollutes our drinking water．Noise pollution makes us angry more easily．

Many countries are making rules to fight pollution．

They stop people from burning coal in houses and factories and from putting dirty smoke into the air．Pollution by SO₂ is now the most dangerous kind of air pollution．It is caused by heavy traffic．We are sure that if there are fewer people driving, there will be less air pollution．

The earth is our home．We must take care of it．

1．        , our world is becoming much smaller．

A．Thanks to the science development

B．Because of the rise in pollution

C．Because the earth is being polluted day and night

D．Because the earth is blown away by the wind every year

2．Hundreds of years ago, life was         it is today．

A．much easier than                                       B．a(chǎn)s easy as

C．a(chǎn)s hard as                                              D．much harder than

3．Pollution comes in many ways．We can even hear it．Here “it” means        ．

A．rubbish              B．a(chǎn)ir pollution          C．water pollution      D．noise pollution

4．Which of the following is NOT TRUE?

A．Many countries are making rules to fight pollution．

B．The problem of pollution is not so serious because there are not so many people living on the earth．

C．The pollution of the earth grows as fast as the world population does．

    D．If people could go to work by bus or bike instead of car or motorbike, it would be helpful in fighting against the problem of SO₂．

5．        is the most serious among the pollution．

A．Water pollution        B．Noise pollution      C．Air pollution          D．Light pollution