摘要：---Oh,sorry,I'm late. I couldn't remember . -----That's all right. Come on. A.where is your house B.where your house is C.Where was your house D.where your house was 根据短文内容.选择最佳答案.when Chinese people find out that someone comes from London,they often say,"London is a foggy city ,isn't it?" British people who visit China often 34 say that London is not a foggy city at all!But if London is not foggy. 35 bo so many people in China think it is?In tact, London used to be a foggy city , 36 in isn't any more.In London peole of this it in pollution came from factories, but a lot of it came from coal (煤)because people used it in their houses 37 warm duing the winter .By the 1950s,Long-don's air pollution had became so 38 that the govemment decided to do something to clean up the air.A new rule was made.It said that 39 was not allowed to bum cosl in any British city.Just a few years 40 ,the air became much cleaner.Now many Chinese cities meet the same kind of 41 with air pollution that London met forty or fitty years ago. However.this problem is more difficult for Chinese cities to 42 .First, more of the pollution comes from big fsctoies than from coal that pcople use in their houses. If these fac-lories are suddenly closed,lots of people 43 their jobs.Second , cleaner fuelsare quite expensive. However, the air in many cities is 44 slowly becoming cleaner,because the govem-ment and ordinary people are trying to make pollution 45 .As a result,the air in Beijing is get-ting cleaner and cleaner.

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