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XX英语四级阅读备考训练题及答案xx英语四级阅读备考训练题及答案 英语作为文科科目当中的一个重要组成部分,需要记忆理解的东西比理科要多的多,所以复习的战线需要拉得更长,下面是为大家搜索的英语四级辅导练习,希望能给大家带来帮助! Although manyof usmay feelair-conditioners bringrelief fromhot,humid orpolluted outsideair,they posemany potentialhealth hazards.Much researchhas lookedat howthe movementof airinside aclosed environment---such asan officebuilding---can spreaddisease orexpose people in thebuilding toharmful chemicals. One of the morewidely publicizeddangers isthat ofLegionnaire’s disease,which wasfirst recognizedinthe1970s.This wasfound tohave affectedpeopleinbuildings withair-conditioning systemsin whichwarmair pumpedout ofthe system’cooling towerswas somehowsucked backinto theair intake通风口,in mostcasesdue topoor design.The warmair,filled withbacteria,was binedwith cooled,conditioned airandwas thencirculated aroundvarious partsofthebuilding.Studies showedthat evenpeople outsidesuch buildingswere atrisk ifthey...。