1. This is a way of learning English, the most popular language in the word.

2. People in the future will make an exact copy of themselves.

3. We may grow human beings in a laboratory in the near future.

4. They are identical in sex and appearance.

5. This mysterious thing is produced from coals.

6. The natural clones of these plants have two major uses, one for eating, one for reproduction.

7. At all the time, producing commercial quantities of concrete things is difficult.

8. We are going on with our research on the cloning of animals.

9. The determination and patience of students will be rewarded with a breakthrough in cloning.

10. Following the progress of English development we shall come to a conclusion that this world language is becoming simpler in sentence structure. IV. Discovering useful words and expressions.

Now you may go to page 13. Finish the four words and expressions exercises in groups of four.

V. Discovering and distinguishing

To find out and write down all the examples of the Appositive ) you are to read the text Cloning: Where is it leading us?

There are differences between appositive clauses and attributive clauses.

●同位语从句仅仅出现在belief, conclusion, doubt, fact, hope, idea, knowledge, law, message, news, notion, order, proof, rumor, sign, suggestion, theory, thought等抽象名词的后面，用于进一步说明或解释该名词的内容。同位语从句通常只能由that引导，一般不能省略。

例1：There are signs that restaurants are becoming more popular wit h families

例2：Have you heard the news that he will be promoted?

●同位语从句有时可用whether或其他连接词来引出 ，但不能用if。

例：The question whether we ought to call in a specialist was answered by the family doctor

●同位语从句与定语从句的区别：同位语从句中的that只起连接作用，不充当语法 成分；而定语从句中的that为关系代词，在句中充当一定的成分，其人称和数须与其先行词 保持一致。

例1：The fact that we have inflation makes it hard for us to buy the food we need同位语从句

例2：A high crime rate exists in cities that have a large percentage of unemployment定语从句

●同位语从句与其先行词之间有时用逗号与其他成分分开，这种情况被称为非限制性同位语从句，用that引导。绝不能认为是非限制性定语从句而用which引导。

例：A label must not be misleading And it is the law, too, that manufactures must list their names and places of business on their labels.

Now you may go to page 14 and do the three structure exercises.

VI. Closing down by talking about cloning

A: Hi, Li Qin. What are you dong?

B: Oh. I am busying looking for the cloning's message. Do you know what is clone?

A; Yes, I do. It is a way of making an exact copy of another animal and plant.

B: I see. Why do people clone the animals and plants?

A: Well, cloning has two major uses．Firstly, gardeners use it all the time to produce commercial quantities of plants. Secondly, it is valuable for research on new plant species and medical research on animals

B: Is it easy to clone the animals?

A: No, it isn't. It's very hard. to clone animals.

B: I think so. I heard that the scientists cloned the sheep Dolly. Is it true?

A: Yes, it is. Altogether Dolly lived for six years and successfully produced a lamb in