Extensive reading

Please enjoy some pictures about dinosaurs.

霸王龙 tyrannosaurus

剑龙 stegosaurs

角龙 ceratopsids

雷龙 brontosaurus

翼龙 pterodactyl

Answer the following questions: 1. Why shouldn’t you clone an extinct animal if there isn’t enough diversity in the group? 2.Why is it wrong to clone an extinct animal if it would have to live in a zoo? 3.Why can’t you clone the DNA of animals that have been extinct longer than 10,000 years?

1. Why shouldn’t you clone an extinct animal if there isn’t enough diversity in the group? Keys: There will not be enough genetic variation in the group to be able to resist new illnesses.

2. Why is it wrong to clone an extinct animal if it would have to live in a zoo? It is not a good idea to clone an animal that would have to live in a zoo because it is not a suitable habitat to develop and increase its numbers. The zoo is not a natural environment for a wild animal.

3. Why can’t you clone the DNA of animals that have been extinct longer than 10,000 years? The DNA of animals more than 10,000 years old is not suitable for cloning, for it can’t survive so long.

1.The writer of the text_____ A. is excited by the possibility of cloning fierce and extinct animals B. believes that extinct animals can be brought back to life by cloning C. thinks it impossible or unsuitable to clone extinct animals like dinosaurs D. dreams of dinosaurs returning to the earth 主旨大意

2. The film Jurassic Park is popular because _____. A. people are interested in the subject of cloning B. all the actors are dinosaurs C. it was directed by a scientist who clones dinosaurs D. it proves very interesting 细枝末节 A

3. Which of the following is true? ____ A.Mice were cloned in B. Dolly the sheep was the first cloned animal. C. The name of the cloned cow is “Bison” D. China was successful in cloning mammals.

4. The reasons why a group of cloned animals all die of the same illness do NOT include____. A. they have the same arrangement of genes B. there isn’t enough diversity in the group for it to overcome illnesses C. the illness is a new one D. their arrangement of genes can not resist that new disease

5. We can infer from the text that____ A. scientists are experimenting to clone dinosaurs B. dinosaurs will never return to the earth C. cloned animals will only live in the zoo D. the DNA of dinosaurs can only survive year 推理判断

1.The popularity of the film Jurassic Park, in which a scientist clones several different kinds of extinct dinosaurs, proves how interested ordinary people are in the subject. 电影《侏罗纪公园》的欢迎证实了普通 人对这一话题是多么感兴趣, 在该电影中 一位科学家克隆了几种不同的恐龙。

2. do an experiment (n. ) carry out an experiment perform an experiment (1) They did an experiment on the monkey to test the new drug. experiment (v.) on / with … (2) Is it right to experiment on animals ? (3) They experimented with the new materials.

3. From time to time people suggest that the animals that have disappeared from the earth, like dinosaurs, can possibly be brought back to life through cloning. 人们时常设想从地球上消失的动物, 例如恐龙, 有可能通过克隆技术使它们复活。 from time to time 有时, 间或, 偶尔, = occasionally, now and then Eg. The car manufacturers changed the car models from time to time. 汽车制造商不时地改变车的型号。

即时练习： 将下列句子译成英语 (1) 他有时变得很没有道理。 ________________________________ ____________ (2) 他们有时吵架。 ____________________________ He becomes quite unreasonable from They quarrel from time to time. time to time.

4. It is useless to clone an animal if there is not enough diversity in the group for it to overcome illnesses. 该群中如果没有足够的多样性使它克服 疾病, 克隆动物就没有用。 当动词不定式、动名词或从句作主语时, 通常把它们放在谓语之后, 而用 it 作句子 的形式主语。

5. Diversity in a group means having animals with their genes arranged in different ways. 群中的多样性指的是拥有基因排列方式不 同的动物。 with their genes arranged in different ways 作定语, in different ways 以不同的 方式。

6....but others will survive and pass on the ability to resist that disease to their children 其他的将存活下来并传递给其后代抵抗这 种病的能力。 resist + n. / doing 抵抗, 对抗 ; 抵挡, 防止 ; ( 与 cannot, could not 连用 ) 无法抗拒, 无法抵挡 (1) They resisted the attack. 他们抵抗那次攻击。 (2) She resisted being carried off. 她拒绝被带走。 (3) She could not resist the temptation. 她无法抗拒那项诱惑。

即时练习： 将下列句子译成英语。 (1) 我无法抵挡巧克力 。 _______________________ (2) 他们决定留下来抵抗敌人。 ____________________________ _________ I cannot resist chocolate. They decided to stay and resist the enemy.

base on/upon 以 …… 为基础, 依据 其结构为 : base sth. on / upon sth. is based on /upon (1) They based their arguments on facts. (2) The film is based on a novel by Lu Xun. 7. Based on what we know now, you can not clone animals that have been extinct longer than years. 据我们现在所知, 绝种一万年以上的动物不能克隆。

P.14 be bound to do sth. 注定；有义务做 …… (1) The weather is bound to get better tomorrow. (2) He is bound to win. (3) I feel bound to tell you that you are drinking too much.

P.18 pay off A. pay off ( 事业、计划等 ) 成功 ; 得到好结果 (1) Did your plan pay off ? (2) All his efforts paid off. B. 付清薪水并解雇 (3) His work was most unsatisfactory, so we paid him off at the end of the week. C. 偿还（债务等） In the end he paid off all his debts. 最终他还清了所有的债务。