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
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