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北京市2017届高三综合练习 英语 一、单选题（共15小题） 1．______ environmental damage is done，it takes many years for the ecosystem to recover． A．Even if-B．If only C．As if-D．Once 2．We can’t figure out ______ quite a number of insects and birds are dying out． A．that-B．as-C．why-D．when 3．Peter’ shirt looked just the same as Tom’s，but it cost ______ his． A．as much twice as-B．twice as much as C．much as twice as-D．as twice much as 4．Teenagers ________ their health because they play computer games too much． A．have damaged-B．are damaging C．damaged-D．will damage 5．_____in the sports world，a sportsman needs to train constantly to keep himself in best condition． A．Survive-B．Surviving C．To survive-D．Survived 6．I have ______ all the papers but I still can’t find my notes． A．looked for-B．looked through C．looked after-D．looked out 7．________ around the Water Cube，we were then taken to see the Bird’s Nest． A．Having shown-B．To be shown C．Having been shown-D．To show | 
