1. | Science still a cure for cancer. | |||||||||||||||||||
a. | doesn’t find | c. | hasn’t found | |||||||||||||||||
b. | haven’t found | d. | aren’t finding | |||||||||||||||||
2. | While he a route to the Indies, Columbus discovered America. | |||||||||||||||||||
a. | arched | c. | had arched for | |||||||||||||||||
b. | was discovering | d. | was arching for | |||||||||||||||||
3. | Existing rerves of fossil fuel by 2045. | |||||||||||||||||||
| 消防安全主题绘画 | a. | have been run out | c. | is going to be run out | ||||||||||||||||
b. | will have run out | d. | have run out | |||||||||||||||||
4. | If logging of tropical rainforests continues at the prent rate, a 30 per cent increa in atmospheric CO2 by the year 2000. | |||||||||||||||||||
a. | there will be | c. | there would be | |||||||||||||||||
b. | there might have been | d. | there could not have been | |||||||||||||||||
5. | Only by investing heavily in value-added exports from the prent trade imbalance. | |||||||||||||||||||
a. | the country can emerge | c. | can the country emerge | |||||||||||||||||
b. | the country might emerge | d. | the country emerged | |||||||||||||||||
6. | The mystery of the double helix , the scope for genetic engineering dramatically incread. | |||||||||||||||||||
a. | having solved辞退员工的技巧 | c. | solving | |||||||||||||||||
b. | having been solved | d. | solved | |||||||||||||||||
7. | Since the mid-’60s considerable rearch in embryo transplants .致敬袁隆平 | |||||||||||||||||||
a. | 就业证是干嘛用的has carried out | c. | has been carried out | |||||||||||||||||
b. | was done | d. | was carried out | |||||||||||||||||
8. | veral hypothes have been advanced for the disappearance of the dinosaur, no conclusive evidence supports any of them. | |||||||||||||||||||
a. | despite | c. | although | |||||||||||||||||
b. | in spite of | d. | in spite of the fact | |||||||||||||||||
9. | Until the 16th century the earth to be flat. | |||||||||||||||||||
a. | is believed | c. | believed | |||||||||||||||||
b. | has been believed | d. | was believed | |||||||||||||||||
10. | If the temperature of the reactor 500C higher meltdown would have occurred. | |||||||||||||||||||
a. | was | c. | was being | |||||||||||||||||
| 孙子简介 | ||||||||||||||||||||
b. | had been | d. | had | |||||||||||||||||
11. | adequate precautions are take, there is no risk involved in the operation. | |||||||||||||||||||
a. | Although | c. | Nevertheless | |||||||||||||||||
b. | Providing | d. | Even | |||||||||||||||||
12. | My supervisor advid me to the problem. | |||||||||||||||||||
a. | look ahead | c. | look out of | |||||||||||||||||
b. | look down | d. | look into | |||||||||||||||||
13. | The more acid you add to the solution, it becomes. | |||||||||||||||||||
a. | cloudier | c. | the cloudiest | |||||||||||||||||
b. | the cloudier | d. | more cloudy | |||||||||||||||||
14. | The lecturer said ‘It’s time you the literature review.’ | |||||||||||||||||||
a. | began | c. 无过 | should begin | |||||||||||||||||
b. | begin | d. | are beginning | |||||||||||||||||
15. | After studying our experimental results, the tutor suggested the experiment. | |||||||||||||||||||
a. | us to repeat | c. | we repeat | |||||||||||||||||
b. | that we to repeat | d. | me to repeat | |||||||||||||||||
16. | After your results you should make an appointment with your tutor. | |||||||||||||||||||
a. | you receiving | c. | you have received | |||||||||||||||||
b. | you would have received | d. | you received | |||||||||||||||||
17. | You the experiment twice, not once. | |||||||||||||||||||
a. | should have carried out | c. | haven’t carried out | |||||||||||||||||
b. | shouldn’t have carried out | d. | couldn’t have carried out | |||||||||||||||||
18. | It looks you’ve made a mistake. | |||||||||||||||||||
a. | as | c. | if | |||||||||||||||||
b. | as though | d. | perhaps | |||||||||||||||||
19. | After receiving her results, the student stopped . | |||||||||||||||||||
a. | to worry | c. | worrying | |||||||||||||||||
| 打边炉是什么意思 | b. | having worried | d. | to be worried | ||||||||||||||||
20. | You include this ction. It is not necessary | |||||||||||||||||||
a. | must | c. | don’t need | |||||||||||||||||
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