课时提升作业(二十一)

　　必修 Unit 1

　　Ⅰ. 单项填空

　　1. (2017·宁波模拟)　to nuclear radiation, even for a short time, may influence genes in human bodies.

　　A. Exposed　B. Being exposed

　　C. To expose

　　D. Having exposed

　　2. When he came back three hours later, they were still sitting on the sofa, ________ in conversation.

　　A. absorbing

　　B. absorbed

　　C. to absorb

　　D. to be absorbed

　　3. (2017·西安模拟)The idea of traveling abroad really　a lot of Chinese people. That’s why every year witnesses more people applying for passports.

　　A. sticks to B. contributes to

　　C. attends to

　　D. appeals to

　　4. (2017·吉林模拟)You’d better give up smoking, Tom, for many diseases areto smoking, you know.

　　A. linked　B. ledC. exposedD. blamed

　　5. The doctoryou for your cough is sure toit.

　　A. curing; treat B. cures; treating

　　C. treating; cure

　　D. treats; cure

　　6. It was the boy, rather than his teachers, thatfor what the boy had done.

　　A. were to blame B. were to be blamed

　　C. was to blame

　　D. was to be blamed

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