3.It is on this arable land that the farmers produce food for the whole population of China.(改写成不强调的普通句)__________________________________.

2.The weather outside has no effect on the temperature in greenhouses.

The temperature in greenhouses _________ _________ _________ no _________ _________ the weather is outside.

1.Scientists started to develop new techniques to increase production from early 1990s. (用强调句型强调划线部分)______________________________________________.

10.Autumn _________(耕田)should be deeper than the spring one.

9.Jia Sixie's book is a practical g_________ to farming.

8.If you go a_________ nature,you will have to do more work and the results will not be so good.

7.We should develop agriculture without d_________ nature and environment.

6.Today many vegetables are grown not in gardens but in g_________.

5.The biggest problem is the _________(缺少)of arable land.

4.Farmers have long used _________(技巧)such as irrigation to increase production.