1. protection n. 保护；防卫

8. Typical for China is the crosstalk show, where a pair of

　　 comedians entertain the audience with word play.

　 　☆重点词汇☆

7. What comedians have in common with the players in a

　　 comedy is their way of playing with words.

6. Acting our stereotypes of people from different countries

　 can be very funny.

5. Much of the wisdom discovered by early Chinese

　 scientists is still useful for farming.

4. Not only is food production important but also taking

　　 care of the environment.

3. To make as much use of the land as possible, two or

　 more crops are planted each year where possible.

2. It is on this arable land that the farmers produce food

　 for the whole population of China.

1. What do you think causes these changes?

8. Children at the beginning of this century ____ a lot and ____ themselves greatly even without television.

A. used to read; enjoying　　 B. used to read; enjoyed

C. were used to reading; enjoy

D. were used to read; enjoying

[解析]选B　 前后时态要保持一致。