精品一区二区免费在线观看_国产精品久久久久久av福利软件_97成人精品区在线播放_国内成人精品一区

On 5 July 1996, a lamb was born in a shed in Scotland．It was called Dolly and it was an exact copy, or clone of another sheep．A clone is a method of copy a living thing．Scientists have been able to clone plants and bacteria(細菌)for a long time．Now that Dolly has been born, we can clone adult animals and probably even humans as well! In July 1998, scientists cloned twenty-one mice using the same method that was used to make Dolly．These proved that this way of cloning really works．

Making a copy of a living thing is much more difficult than making a copy of something that isn’t living(1ike a mountain bike)．For many years, people have tried to make robots that look and behave like humans．But in real life, scientists haven’t been very successful．Some countries are passing laws to stop scientists cloning humans, because it is such a terrifying thing to do．Robots still look like hunks of metal．They don’t move like we do, and they don’t think like we do．

1 What is clone?

A. A clone is Dolly．             B. A clone is an exact copy of a living thing．

C. Clone is the name of a sheep．   D. A clone is some plants and bacteria．

2. he underlined word“copy”in the passage means         ．

A. 印刷    B. 復印    C. 復制   D. 抄襲

3. What did scientists clone two years later after Dolly was born?

A. Mice     B. Plants     C. Robots   D. Humans

4. Which of the following is true?

A. Making a copy of something that is living is difficult．

B. It is breaking the laws to clone humans all over the world．

C. Scientists have been very successful in cloning humans．

D. People have made robots that look and behave like humans．

5. The main idea of the passage is“       ”．

A. Dolly is a Cloned Sheep

B. All Living Things can be Cloned

C. What is Clone

D. The Difference between Cloned Things and Robots