完形填空 (30分)
阅读下面短文，从短文后所给的四个选项中，选出可以填入空白处的最佳选项。
A
In today’s world, pollution has become a serious problem.  51.  we know, air pollution is harmful to our health. However, not all people know that noise    52  also a kind of pollution and is harmful to human health.
People who work and live in noisy conditions may become   53  . For example,  many of the workers who   54.  newspapers and books become deaf. Quite a few people living near   55 also have hearing lose. Recently it was reported that many teenagers in America  56  hear better than the old do, because these young people always listen to  57  pop music.  Making a loud noise in public is also a kind of pollution, it not only  58  others but also does great harm to hearing. Cars and machines also produce 59  noise. It makes people feel uncomfortable and unpleasant.  60  , it can cause them to be sick or deaf.Nowadays many countries are trying to solve all sorts of environmental problems, including noise pollution.

A．So B．While C．As D．And

A．are B．is C．was D．were

A．excited B．dead C．thin D．deaf

A．make B．print C．catch D．take

A．factories B．airports C．schools D．gyms

A．can B．may C．can’t D．mustn’t

A．slow B．light C．fast D．loud

A．helps B．disturbs C．causes D．makes

A．much too B．lots of C．a little D．too many

A．By the way B．we know C．For example D．What’s more