题目内容：

完形填空

阅读下面短文，掌握其大意，然后在每小题所给的四个选项中选出一个最佳答案。

When Chinese people find out that someone comes from London, they often ask, "London is a foggy city, isn't it?" British people who visit China often        say that London is not a foggy city at all! But if London is not foggy,         do so many people in China think it is? In fact, London used to be a foggy city,        it isn't any more.

        In London lots of its pollution came       factories, but a lot of it came from coal because people used it in their houses to keep warm during the winter. By the 1950s, London's air pollution had become so        that the government decided to do something to clean up the air. A new rule was made. It said that        was not allowed to burn coal in any British city. Just a few years       the air became much cleaner.

        Now many Chinese cities meet the same kind of         with air pollution that London met forty or fifty years ago. However, this problem is more difficult for Chinese cities to         . First, more of the pollution comes from big factories than from coal that people use in their houses. If these factories are suddenly closed, lots of people        their jobs. Second, cleaner fuels(燃料) are quite expensive. However, the air in many cities is already slowly becoming cleaner, because the government and ordinary people are trying to make pollution less.

1.A. must B. have to C. should D. will

2.A. what B. when C. which D. why

3.A. and B. but C. so D. or

4.A. from B. in C. out D. on

5.A. well B. good C. badly D. bad

6.A. somebodyB. anybody C. nobody D. everybody

7.A. before B. ago C. later D. after

8.A. problem B. question C. accident D. discussion

9.A. find B. answer C. solve D. save

10.A. lost B. lose C. would lose D. will lose