1. Unit 4 Reading 乌海十中 陈璐

2. Paragraph1 Paragraph2 Paragraph3 Paragraph4 Paragraph5 A widely accepted theory about the formation of the universe The importance of water for life The formation of the earth The arrival of humans and their effect on the earth The development of plants and animals on the earth Match the main idea for each paragraph.

3. Answer the following questions( 细节理解 ) ： 1.How did the atmosphere on the earth appear? A.It came from space. B.It came from the cxposion C. It came from the ocean D. It came from the forests 2. In our solar system,why does life only exist on the earth? A.Because it is very warm on the earth. B.Because it is cool enough on the earth. C.Because there is plenty of water. D.Because it is big enough.

4. 3.Why did plants appear earlier than animals? A.Because plants could produce oxygen,which was important for animals. B.Because plants were more advanced than animals. C.Because animals needed more water. D.because plants needed more water.

5. 推理判断 4.According to the passage we can know____ A.Only the earth has life on it in space. B.Oxygen in the atmosphere on the earth came from the Big Bang C.Humans are the cleverest animals of the earth D.Plants played an important part in the appearance of animals.

6. 1 system. n 系统，制度 e.g. They have an alarm system in the house. （练） It has been a long established___that Spring Festival is a time for family reunion in China. A. tradition B. history C.intelligence D. system Language points A

7. 2. in time 及时，总有一天, 终于 e.g. You’ll get used to the weather in Nanjing in time.(=sooner or later) on time____ ahead of time:______ all the time______ at a time______ at all times______ at times_______ at any time _____ at no time______ at one time ______ at the same time______ at the time______ behind time______

8. ( 练 )1 ） Bob got seriously injured in the traffic accident,but fortunately,the doctor came___ to save hes life. A. in time B. on time C. at last D. for sure 2)Fred and jim didn’t like each other at first,but ____ they became friends. A. on time B. at a time C. all the time D. in time A D

9. 3. harmful: adj, 有害的，可致损伤的 be harmful to : 对 …… 有害 e.g. Smoking is harmful to your health. e.g. These are the harmful effects of smoking harm:n, 损害，伤害 harmlessly: adv, 无害地 harmless: adj, 无害的 harmlessness:n, 无害 do more harm than good. 弊大于利 do sb harm do harm to sb 对某人有害

10. There is no harm in (sb’s) doing sth.( 某人 ) 做 某事无害处 It does no harm(for sb) to do sth.( 某人 ) 做某事 无害处

11. 4. presence: n [U] 出席，到场，存在 in the presence of sb. 在某人面前 ; 有某人在场 e.g. He never seemed at ease in the presence of me. present: n 礼物. v 赠予. adj 出席的，到场的 absence: n 缺乏 absent: adj, 缺席，不参加 be present at: 出席，参加 be absent from : 缺席，不参加

12. 5. in one’s turn: 轮到某人，接着 e.g. Tom will be on duty in his turn tonight. (1)by turns 轮流，交替 e.g. The two brothers looked after their sick mother by turns. (2) in turn: 依次，反过来 e.g. Each man in turn stood up and spoke. (3) It’s one’s turn to do sth. 轮到某人做某事 It’s your turn to wash the dishes

13. 6.prevent……(from) doing… stop….(from)doing… 阻止某人做某事 keep….from doing… 没用什么事能阻止我去那 ________________________________ ( 练 )people will thank the fire-fighters for the things they do to prevent fires____the environment safter. A.make B. to make C. from making D. making Nothing could prevent me (from) going there.

14. 7.puzzle: n, 难题，迷 v, 使迷惑 e.g. Tom is clever enough to solve puzzles. e.g. 令我迷惑的是他们为什么没用出现。 _____ puzzles me is ____ they didn’t turn up. puzzling: adj, 令人困惑的 puzzled: adj ，感到困惑的 That’s really a _____problem. She was listening with a _____ expression on her face. What why puzzling puzzled

15. ( 练 )The____ look on her face suggested she ___the ___maths problem. A.puzzled, be puzzled by,puzzling B.puzzling, was puzzled by,puzzled C.puzzled, was puzzling over, puzzling D.Puzzling,be puzzled over, puzzled.