选修八unit2知识点汇总

Unit 2 Cloning语言要点（模块）Ⅲ.重点词汇（旨在提供词汇综合运用所需材料）1. differ vi. 不同；相异difference n. 不同之处different adj. 不同的[典例]1). Their house differs from mine in having no garage. 他们的房子与我的不同，区别在于他们的没有起车库。

2). The two sides still differ with each other over the question of pay. 双方在报酬的问题上仍各持己见。

[重点用法]A differs fromB in... A与B在……方面不同 A differs with B about/on/over... A与B 就……意见相左2. undertake vt. (undertook; undertaken) 着手；从事；承担；同意，答应，保证(后接to do) [典例]1). She undertook the responsibility for these changes. 她承担了做出这些改变的责任。

2). He undertook to pay the money back in one month. 他答应在一个月之还钱。

3. forbid vt. (forbade or forbad; forbidden) 禁止；不准；阻止妨碍[典例]1). The law forbids the use of chemical fertilizers. 法律禁止使用化学肥料。

2). I forbid you to tell anyone. 我不准你告诉任何人。

[重点用法]forbid sth. / doing sth. 禁止，不许（做某事）forbid sb. to do sth. 禁止某人做某事4. accumulate vt.&vi. 积累；聚积accumulation n [u,c] 积累[典例]1). By investing wisely she accumulated a fortune. 她由於投资精明而积蓄了一笔财产。

2). Dust and dirt soon accumulate if a house is not cleaned regularly. 房屋不经常打扫, 尘土很快就越积越多。

5. owe vt. 欠；应该把……归功于；感激，感恩[典例]1). He owes his father £50. = He owes £50 to his father. 他欠他父亲50英镑。

2). We owe this discovery to Newton. 我们的这一发现归功於牛顿。

[重点用法]owe sb sth = owe sth to sb 欠(某人)债owe sth to sb/sth将某事物归因或归功於某人/事[练习] 根据句子的要求在括号里填入适当的介词。

1). How much do I owe you _______ the groceries?2). He owes his success more _______ luck than _______ ability.3). I owe a lot _______ my wife and children.Keys: 1). for 2). to; to 3). to6. retire vi.退休(役)；退出，撤退；就寝[典例]1). He will retire from the army next year. 他明年从部队退役。

2). Our forces retired to prepared positions. 我们的部队撤退到既设阵地上。

[重点用法]retire from... 从……退休(役)/退出retire (from...) (to...) 退下，退出，离开（尤指到僻静处）7. bother vt. 打扰vi. 操心n. 烦扰[典例]1). I am busy; don’ t bother me now. 我很忙，现在别打扰我。

2). I am sorry to bother you, but can you tell me the time. 对不起，打扰了，请问现在几点? [重点用法]bother with/about 一为……而烦恼；因……操心bother to do / doing费神做……[练习] 根据句子的要求在括号里填入适当的词或翻译。

8. obtain vt. (正式；尤指通过努力或计划) 获得；得到obtainable adj能得到的; 可获得的[典例]1). I haven’ t been able to obtain that record anywhere. 我到处都没买到那唱片。

2). He said that the police had obtained this information by illegal means. 他说警方是靠非法手段获得这一资料的。

[重点用法]obtain sth from sb/sth 从……获得某物[练习] 根据句子的要求在括号里填入适当的词。

1). Are his records still ______ (obtain)?2). Further information can be obtained _______ (介词) head office.Keys: 1). obtainable 2). FromⅣ.重点词组（旨在提供综合运用所需材料）1. pay off 得到好结果，取得成功(常用主动态)；偿清债款；付清工资解雇[典例]1). At last, his hard work paid off. 最后，他的努力得到了回报。

2). Did your plan pay off? 你的计划成功了吗?[短语归纳] pay短语：pay for付……的钱；为……而付出代价pay back sth. (pay sb. back sth.) 偿还pay sb. (...) for sth. 因某事而付某人…… pay sb. (...) to do sth. 付某人(……)去做某事[练习] 用与pay相关的词组或所给词适当的形式填空。

1). After ten years of hard working she finally _______ _______ her debt.2). Our efforts are sure to ________ ________.3). Her parents ________ ________ America.4). Have you ________ the milkman this week?5). Have you ________ the money _______ the bank yet?6). I will _______ you _______ next week.7). I paid the boy ten yuan _______ (clean) the window.Keys: 1). paid off 2). pay off 3). paid for 4). paid5). paid; to 6). pay; back 7). to clean2. in favor of 赞成；支持；对……有利[典例]1). I am in favor of your suggestion. 我赞成你的提议。

2). I talked to Susan about it, and she’ s all in favor of going. 我与珊谈了这件事，她完全赞同走。

[重点用法]ask a favor请求帮忙 do sb. a favor = do a favor for sb. 帮某人的忙3. be bound to do 一定；注定(做)[典例]1). The weather is bound to get better tomorrow. 明天天气一定会变好。

2). You’ ve done so much work that you're bound to pass the exam. 你下了这麽大工夫, 一定能考及格。

4. be in good/poor/excellent condition 处於好的﹑坏的﹑极佳的状况[典例]1). The ship is not in a condition/is in no condition to make a long voyage. 此船的现状不适宜远航。

2). The car is still in excellent condition. 这小车状况极佳。

[短语归纳] condition 短语：out of condition健康状况欠佳working/living/syudying conditions工作、生活、学习环境on condition (that)... 在……条件下；倘若……on no condition 一点也不; 决不Ⅴ.重点句子（旨在提供句子结构等所需材料）1. The fact that she seemed to develop normally was very encouraging. 她（多莉羊）似乎生长正常的事实很鼓舞人心。

[解释] “that she seemed to develop normally”是一个同位语从句，作the fact的同位语。

同位语从句一般由that引导，常放在fact，truth，news，information，idea，thought，hope，suggestion，advice，reply，remark，report等名词后面，说明该名词的具体容。

当先行词是problem，question或当主句是表示疑问或否定意思时，连接词要用whether或其他的疑问代词或副词。

如：1). The news that he has been elected president of the United States is true. 他当选美国总统的消息是真的。

2). The question whether we should continue to do the experiment has not been answered yet.我们是否该继续实验的问题还没有被解决。

3). I have no idea where the new library will be built. 我不知道新图书馆将要建在哪。