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约1840字。

　　选修8  Unit 2   Cloning
　　基础操练
　　Ⅰ. 单词拼写
　　1．It is            (合情理的) to assume that he knew beforehand that this would happen.
　　2．20 years ago, because of the            (保守的) views of her parents, she got married to a man against her will.
　　3．When the football match was over, he lay on the playground,            不能) to move.
　　4．He was cast down when the            (程序) he had used to produce a mammal clone ended in failure.
　　5．I didn’t know anything about any of the books so my choice was quite            (任意的).
　　6． Mr Zhang, who had completed 40 years of teaching,             (退休) from teaching last month because of ill health.
　　7．The old lady gave away an impressive collection of oil paintings she had             (积累) to the national art gallery.
　　8． In Britain education is            (义务的) for all children between the ages of 5 and 16.
　　9．Despite the fact that he’s fed up with too many rules and             (规章), he has to obey all of them.
　　10. Her books have gained in             (受欢迎) with teenagers in recent years.
　　11. She couldn’t             (忍住) laughing when she saw the young man.
　　12. To say that this law will not affect our profits is to talk             (胡说).
　　13. The doctor explained that this was a             (复杂的) procedure that he should consider carefully.
　　14. It is reported that scientists have achieved a major             (突破) in the treatment of this type of cancer.
　　15. The old painting was damaged in the flood and had to be             (修复).
　　16. I knocked at the door loudly in the             (徒劳的) hope that someone might answer.
　　17. After she’d got over (=overcome) her             (开始的) shyness, she became very friendly.
　　18. The film was highly praised, but was not a             (商业的) success.
　　19. The President returned to work             (不久) after his operation.
　　20. Your report is good and I’ve made only a few small            (修改) to it.
　　Ⅱ. 用方框内所给短语的适当形式填空
　　pay off;   cast…down;      be bound to;     strike…into one’s heart;   
　　from time to time;    have a great impact on;   in poor condition;  
　　in favour of;         bring…back to life;      owe…to
　　21. If you take a job as a journalist, it goes without saying (不言而喻) that __________________  you’ll have to work at weekends.
　　22. The good news, however, ___________ fear                          of the enemies and they immediately fled in all directions.
　　23. I _______________________ all my debts by the end of next year.
　　24. He felt a bit ______________________ when he failed his final physics exam.
　　25. He turned down a university appointment _______________________ a political career.
　　26. There _____________________ be changes when the new system is introduced next year.
　　27. The leaning tower with a history of hundreds of years is _________________________ and badly
　　needs repairing.
　　28. People in the flood-stricken areas said that they ________________ a great deal _____________
　　the PLA soldiers for their rescue work.
　　29. The computer, as is known to all, has __________________________ modern life.
　　30. Don’t bother yourself about cloning my pet cat. I won’t expect to ________ it                 .
　　Ⅲ. 完成句子
　　31. Cloning scientists ___________________________________ that Dolly’s illnesses were more appropriate to a much older animal. (cast)
　　研究克隆的科学家们很沮丧地发现，多莉得的病更容易发生在年老的羊身上。
　　32．Scientists hold the belief ___________________________________ many important scientific breaghs and medical treatments. (lead)
　　科学家们认为克隆可能会导致许多重要的科学上的突破和疾病的治疗。
　　33．Other animals will survive and pass on the ability ___________________________________ to the next generation. (resist)
　　另外一些动物将会存活下来，并且把抵抗那种疾病的能力传给下一代。
　　34．________________________ what we know now, you cannot clone animals that have been extinct longer than 10,000 years. (base)
　　根据我们现在所知，你不可能克隆那些已经绝种了一万年以上的动物。
　　35．At the meeting they raised an objection to ___________________________________. (treat)
　　在会上他们对受到不公平对待提出了异议。
　　36．His children ___________________________________ sweets because he didn’t want their teeth to be ruined. (forbid)
　　他不准孩子们吃糖果，因为他不想他们的牙齿受损坏。
　　37．___________________________________ is the fact that he seems to take no interest in his work. (bother)
　　最使我伤脑筋的是，他似乎对自己的工作毫无兴趣。
　　38．__________________________ that you might like some coffee, so I’ve brought