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2017届高考英语二轮专题总复习阅读能力培养精品系列（四十八） 完形填空 Nowadays the whole world are worrying about a danger—global warming. In fact this began a long time ago. Yet，not all of us seem to realize it.One day around 30 years ago，the nine million citizens of London heard sirens(a loud noise of warning made by a special machine)all over the town. Emergency services. the __1__，the police，doctors and nurses__2__ by，ready to go into action. In railway and underground stations，people read posters and __3__，telling them where to go and __4__ to do in the emergency. This was Exercise Floodcall. London wasn't flooded yet. But it is __5__ that it will be. In 1236 and 1663 London was __6__ flooded. In 1928，unluckily，quite a __7__ people living in Westminster，the heart of London，__8__ in floods. And in 1953,100 people living on the eastern __9__. The London suburbs，were killed again in the floods. At last，the Great London Council(市政厅)，is taking actions to __10__ this disaster happening again. But the flood __11__ were not built until 1980s. And in the __12__， Londoners must be __13__. When it happens, 50 underground stations will be underwater. Electricity，gas and phone services will be out of action. __14__ will be impassable. It will be impossible to __15__ any of the bridges between North and South London. __16__ —London will look like Venice. | 
