约2210字。

　　Unit 2  The  environment
　　1. debate
　　(1)n.   after a long debate
　　(2)vt. & vi.  debate  (about ) sth. with sb.
　　I debated about the question with Mary.
　　They were debating whether to go to the mountain or to the seaside.
　　2. flow----flowed----flowed
　　(1).vi.  Most rivers flow into the sea.
　　Blood suddenly started flowing out.
　　Her tears flowed freely down her cheeks.
　　(2)n.    flow of …cut off the flow of oil 切断石油输送
　　3．in addition 另外，此外adj.  additional
　　Mary gave us sandwiches for our picnic and a bag of cookies in addition.
　　in addition to 除…之外还有
　　He speaks French in addition to English.
　　In addition to giving a general introduction to puters, the course also provides practical experience.
　　4. wipe out 扫除，消灭, 洗干净
　　These diseases can wipe out the population of the village.
　　5．lay
　　躺，位于lie----lay----lain----lying
　　放置，产卵，下蛋lay----laid---laid---laying
　　撒谎lie----lied----lied---lying
　　6. approach
　　(1).vt.    After 2 hours’bing, we approached the top of the mountain.
　　(2).vi.    Approach to science. 走进科学（CCTV节目名称）
　　As winter approached the weather bee colder.
　　(3).n.   All approaches to the town were blocked. 通向……的路
　　make  approaches  to sb.   想法接近……
　　7.  cut back on = cut down on = reduce
　　The doctor told him to cut back on foods containing too much fat and sugar.
　　I won’t have a cigarette, thanks------I’m trying to cut down on them.
　　8. beneficial       n. v. benefit
　　(1). adj.  have a beneficial effect
　　be beneficial to……
　　Fresh air is beneficial to your health. 
　　(2). n.    for the benefit of ……为了……的利益
　　be of (great) benefit to sb./sth.
　　The new law will be of great benefit to us.
　　(3). v.   benefit from/by   ……受益于……
　　benefit sb.   使……受益
　　I benefited from my father’s advice.
　　These credit cards benefit us.
　　9. responsibility       adj. responsible
　　(1)n. Now that you are a grown-up, you should have more sense of responsibility.更有责任感
　　Being a mother, she knows that she has many responsibilities.
　　(2)adj.    be responsible for…对负责任
　　The pilot of the plane is responsible for the passengers’safety.
　　You are responsible for keeping the classroom clean and tidy.
　　10. willing     n. willingness   
　　be willing to do sth.  愿意做，乐意做
　　she is willing to help anybody who is in trouble.
　　She is a willing horse in the office. 这是固定说法，指积极工作的人
　　11．open the floor (for…) 为…而发言the floor指发言权
　　The floor is yours----you may present your argument.
　　12. run out  (of)
　　sth. run out              run out of sth.
　　The petrol is running out.