根据要求完成下列各小题。

①__________

THE Earth is about 4,600 million years old．Many of the things that we have done are good, but many more are not good for the Earth．

Pollution is ②（地球上的一种严重问题）．In big cities cars and buses have polluted the air．Many people in cities now have very bad health problems．

③（工厂也对土地和水造成了污染）．As a result, many rivers and lakes are now polluted．

All over the world, people have cut down millions and millions of trees．Did you know many kinds of animals and plants are now disappearing （消失)? In particular, trees are very important ④because they produce oxygen （氧气）and control the climate．

Now, many people are beginning to take these problems seriously．They are making wind generators （发动机）and planting new trees．There is a group in our class that picks up the garbage at school．Whether the weather is hot or cold we always do it．⑤I think we are setting a good example to everyone else．

I hope, in the future, the sky can be clearer, the water cleaner, and the land greener．Then both people and animals can have a greener Earth．

1．请在①出给出文章的题目。

2．请把②的汉语翻译成英语。

3．请把③的英语翻译成汉语。

4．请把④的画线部分翻译成汉语。

5．请把⑤的画线句子翻译成汉语。