Complete the summary of the story with one word in each blank.

CLONING：WHERE IS IT LEADING US?

Cloning is a kind of technology that makes a 1 of another animal or plant. It has two 2 uses. Firstly, gardeners use it to improve the production of some plants. Secondly, it is of great value in the

3 on new plant species and 4 research on animals. But it is not easy to do the cloning, especially in the 5 of cloning animals. In 1996, scientists cloned the sheep Dolly. She seemed to be 6 at first, but later she became seriously ill. Altogether she lived for six years. But she successfully gave 7 to a lamb. However, Dolly's 8 makes people see the 9 of using cloning to 10 serious illnesses and even producing human beings. Governments became nervous and even 11 research into human 12 . They feared that it might be not used properly. At the same time, scientists also 13 whether cloning will help or 14 us and where it is 15 us.

（Key：1. copy 2. major 3. research 4. medical 5. procedure 6. normal 7. birth 8. appearance 9. possibility 10. cure 11. forbade 12. cloning 13. wonder 14. harm 15. leading） Comprehension questions

1. Cloning is something_____ in our life.

A. new. B. rare C. to disappear D. happening

2. Which of the following is NOT TRUE.

A. Dolly is the first successful cloning that scientists have ever tried.

B. Dolly also had a father and a mother.

C. Dolly died at the age of six.

D. Dolly gave birth to a lamb in the natural way.

3. Dolly's appearance brought out all the effects except that _____.

A. lots of people were against it

B. the media and public imagination were shocked at it

C. scientists found out how to cure serious illnesses by using cloning

D. it is possible to produce human beings by using cloning

（Key： 1. D 2. B 3. C） Notes to some difficult sentences

1. It also happens in animals when twins identical in sex and appearance are produced from

the same original egg. 这种现象也发生在动物身上，从同一个原生卵产生性别与外貌相同的双胞胎也是克隆。

Identical in sex and appearance 是一个形容词短语做后置定语，修饰twins。Identical twins 同卵孪生。identical 为形容词，常与with或 to 连用，表示与......完全相同。

2. Firstly, gardeners use it all the time to produce commercial quantities of plants.

首先，园艺师一直用它生产大量的供商用的植物。

本句中commercial (adj.商业的)和quantities of（大量的）共同修饰plants。Commercial还可以做名词，意思是广告（advertisement inserted in a TV or radio programme.）。

3. Then came the disturbing news that Dolly had become seriously ill. 后来传来令人不安的消息，说是多利病的厉害。

本句为倒装句。主语是the disturbing news， 谓语动词是came。而that引导的是the disturbing news的同位语从句。

4．The question that occurred to the scientists was："Would this be a major difficulty for all cloned animals？"科学家们脑海里产生的问题是："这是不是所有克隆动物都将面临的一个主要问题呢？"

occur to 为不及物动词短语，不能使用被动语态。可以在此替换使用的词有come，strike。

5．Newspapers told stories of evil leaders hoping to clone themselves and religious leaders raised moral questions.报纸报道说，邪恶领袖希望克隆自己；宗教领袖对此提出道义问题。

本句中evil leaders hoping to clone themselves 是动名词复合结构，evil leaders和hoping...是逻辑主谓关系。