【WhenChinesepeoplefindoutthatsomeonecomesfromLondon，theyoftensay，"Londonisafoggycity，isn'tit？"BritishpeoplewhovisitChinaoften（26）___saythatLondonisnotafoggycityatall!ButifLondonisnotfoggy，（2】

　　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（26）___say that London is not a foggy city at all!But if London is not foggy，（27）___do so many people in China think it is？In fact，London used to be a foggy city，but it isn't any more．

　　In London lots of its pollution came from 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（28）___that the government decided to do something to clean up the air．A new rule was made．It said that（29）___was not allowed to bum coal in any British city．Just a few years（30）___，the air became much cleaner．

　　Now many Chinese cities meet the same kind （31）___with air pollution that London met forty or fifty years ago．However，this problem is（32）___for Chinese cities to solve．First，more of the pollution comes from big factories than from coal that people use in their houses．If these factories are suddenly（33）___，lots of people may lose their jobs．Second，cleaner fuels are quite expensive．However，the air in many cities is（34）___slowly becoming cleaner，because the government and ordinary people are trying to make pollution（35）___．

　　26．A．mustB．have toC．shouldD．will27．A．whatB．whenC．whichD．why28．A．seriouslyB．terribleC．goodD．badly29．A．somebodyB．anybodyC．nobodyD．everybody30．A．beforeB．agoC．laterD．after31．A．problemB．questionC．accidentD．discussion32．A．much difficultB．much moredifficultC．more easierD．much easier33．A．closedB．closeC．ope