我们必须尽一切所能保持生态自然的平衡。

The gymnast lost her balance and fell off the bar.

那位体操运动员身体失去了平衡，从平衡木上掉了下来。

8. sb. / sth. play a... role (part) in... 在......方面起......作用

例：Everyone plays a part in fighting against crime.

　　与犯罪活动作斗争，人人有责。

　　She has played an important role in protecting the nature.

　　她在保护大自然方面起了重要作用。

9. In fact, it is you who have the most important role to play in stopping Yellow River erosion.事实上，你就是阻止黄河水土流失最重要的人。

强调句：It +is/ was +被强调的部分+that/ who+其他+...（此结构可用于强调主语、宾语、状语）

I bought him a dictionary in the bookshop yesterday.→

It was I who bought him a dictionary in the bookshop yesterday.(强调主语)

It was him that I bought a dictionary in the bookshop yesterday.（强调间接宾语）

It was a dictionary that I bought him in the bookshop yesterday.（强调直接宾语）

It was in the bookshop that I bought him a dictionary.（强调地点状语）

It was yesterday that I bought a dictionary in the bookshop.（强调时间状语）

强调谓语：在动词前加do/does/did

I did buy him a dictionary in the bookshop yesterday.

跟踪练习

1.Complete the passage.

How do you usually spend your pocket money? Maybe some delicious snacks ________ you. But have you ever thought about how to use your money in a more meaningful way? Actually, you can use only 5 yuan to buy a green future. Still _____ how your 5 yuan can have so much effect? Well, let's look at the fact below.

________, billions of tons of soil _______ ____ the Yellow River and a lot of farmland ________________, which ____ many local farmers to move to other areas. You may _________this point of view that the work is best done by government. In fact, everyone ________ _______________ stopping Yellow River erosion. So, please ______________ how you'll spend your money next time.

Answers: appeal to puzzled Over time has flowed into has been destroyed forced agree with plays an important part in think twice about

2.单选

1）The police are ＿＿ the public ＿＿ information about the crime.

A. appealing ; of B. appealing to ; for

C. appealing for ; of D. appealed for ; for

2) In the accident, five passengers were killed, ＿＿a foreigner.

A. including B. included C. include D. which were included

3) Will you have a free evening tonight? ＿＿ , let's have a dinner together.

A. If not B. Why not C. If so D. What if

4) It was not until 1920 ＿＿ regular radio broadcast began.

A. while B. which C. that D. since

5) ＿＿ she is not so healthy ＿＿ she used to be?