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一、单选题（共 20 道试题，共 100 分。）V 1. Please bear in mind that correct conduction of precautions can reduce or ______ waterside corrosion to the minimum.
2. It seemed as though nothing could stop the ship from wrecking itself on the shore, where leaking fuel or an escape of Norway rats could ______ an ecological catastrophe(灾难) for wildlife.
3. He____the maths examination if he had worked hard enough, but he didn't.
A. would pass
B. had passed
C. would have passed
4. The views of young people today on politics, social attitudes and life goals greatly ______ from their baby boomer parents.
5. By the time he arrives in Beijing, we ________ here for two days.
A. will stay
B. have been staying
C. will have stayed
D. have stayed
6. If it_____tomorrow, we will stay indoors to have our training class.
C. will rain
D. is raining
7. For the time being, Philips could not say when such a product as this might be ______ available, however.
8. They are trying to ______ the waste discharged by the factory for profit.
9. My uncle's house in the downtown area is much smaller than ours, but it is twice______expensive.
10. ______ is she in London than she rings up her old friend Mary.
C. No sooner
11. A marine shale, once believed to be a black mud rich in organic compounds, is a common source rock to ______ oil.
12. He left orders that nothing ______ until the police arrived.
A. was touched
B. had been touched
C. should be touched
D. was to be touched
13. When Bob and his friends came, we____our supper then.
B. were having
D. are having
14. Every country tries to maintain a(n) ______ balance of trade, which assures it of the means to buy necessary imports.
15. You must speak slowly, so that you can make yourself ________.
D. to understand
16. ____ twice, the postman refused to deliver our letters unless we chained our dog.
A. Being bitten
C. Having bitten
D. To be bitten
17. How many more decades will have to pass ______scientists succeed in providing a cure for cancer？
18. Thank heavens! You have come back home. You should be thankful that you have escaped with only ______ injuries.
19. Scientists have discovered genetic variations that make people more likely to get ______ on cigarettes and more prone to develop lung cancer.
20. It is the business of the petroleum industry to find crude oil and gas and to ______ them from the earth on-shore and off-shore.
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