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Unit 2   µ¥Ôª²âÊÔ
¢ñ. 1. The chemical factories poured waste water into the river.ª¤
2. We should put litter into the bin.ª¤
3. We should plant more and more trees.ª¤
4. Wind is widely used for producing electricity.ª¤
5. Mr. Green¡¯s students are cleaning up the beach.
¢ò. 6. How long have you lived in this city?
7. Where has Mr. Li gone?
8. When are they going to return?
9. Have you ever been to England?
10. Do you like to live in Hong Kong?
¢ó. 11. M: I can¡¯t stand the environment here.ª¤
W: Nor can I. The chemical factory produces terrible gas. It makes me ill.
M: I agree with you. Let¡¯s go and tell the government about it.ª¤
W: OK, let¡¯s go.ª¤
Q: What are they talking about?
12. M: Have you ever been to West Lake?ª¤
W: Yes, I have been there many times.ª¤
M: How do you like it?ª¤
W: I like it very much. There are many beautiful flowers here and there and many fishes are in the clean river.ª¤
Q: Is West Lake polluted?
13. M: What are you doing, Jane?ª¤
W: I don¡¯t know what light pollution is. I¡¯m searching for it on the Internet.
M: Nor do I. After you know it, please tell me.ª¤
W: OK.ª¤
Q: What pollution don¡¯t they know?
14. M: Some people don¡¯t know noise pollution. In fact, it is also a kind of pollution.ª¤
W: Yes. It can make people who work and live under noisy conditions become deaf.ª¤
Q: Can people become deaf because of noise?
15. M: We all know air pollution. It is harmful to our health.
W: I think so. We must do something to stop it.ª¤
Q: Does the woman want to protect the environment?
¢ô.   A plant makes its own food in its leaves. Water comes to the leaves through the roots(¸ù£©. Air comes in through small holes in the leaves. The green color in the leaves uses the water and air to make food for the plant. It also needs sunshine because a plant can make food only when the sun is shining.
Animals and people can not live without green plants. They both eat plants. People and some animals also eat the meat of some animals, which also eat plants.