Question

仔細(xì)閱讀，盡可能使用本單元學(xué)過(guò)的詞匯補(bǔ)全下面的短文

Mr Smith,a 1.        (退休的) professor,who had been 2.      (從事) cloning,gave us a report yesterday. He 3.        (給.. 印象) us as a learned person and his talk was 4.        (中斷) by our warm applause 5.        (不時(shí)) .

  Mr Smith explained that cloning was a way of making an 6.        (精確的) copy of another animal or plant. After many years' efforts,scientists' determination and patience 7.        (是值得的) and they made a great 8.       (突破) in 1996. A sheep was cloned successfully. However,she lived six and a half years 9.        (總共) .Scientists were 10.        (沮喪) .How to avoid such problems 11.        (閑擾) scientists. Mr Smith also said the copy had many 12.        (缺點(diǎn)) .For example* they couldn't 13.        (抵抗) diseases from their families.

  When asked whether we could clone extinct animals ? Mr Smith said human beings were 14.        (未能) to do this. These efforts were 15.     (白費(fèi)力氣) .

Answer 1

1.retired   2. undertaking   3. struck   4. interrupted  5. from time to time   6. exact   7. paid off  8. breakthrough   9. altogether/in all   10. cast down 11. bothered   12. drawbacks   13. resist   14. unable   15. in vain