1、Unit4 readingI.Read the text and match the main idea of each paragraph.Paragraph 1: a.The importance of water for life Paragraph 2: b.The development of plants and animals on the earth Paragraph 3: c.The formation of the earth Paragraph 4: d.A widely accepted theory about the formation of the univer
2、se Paragraph 5: e.The arrival of humans and their impact on the earth II.Fill in the blacks. The development of the earth Time The earth A cloud of dust A solid globe Exploded with fire and rock Produce C/N water vapor, etc. Water began to appearIII.Can you put the order of development of life into
3、a time line?1. Insects and amphibians appeared. 2. Dinosaurs appeared.3. The earth became a solid ball. 4.Small plants grew on the water.5. Reptiles appeared. 6. Plants began to grow on dry land.7. The earth was a cloud of dust 8. Water appeared on the earth9. Shellfish and other fish appeared. 10.
4、The universe began with a “Big Bang”.11. Clever animals with hands and feet appeared 12. Mammals appeared.IV.Whats the writing style of the text?A. Narrative 记叙文B. Explanation 说明文C. Essay 散文v. Phrases and Useful Expressions1. circle around 2. according to 3. a widely accepted theory 4. in all direct
5、ions 5. in time 6. cool down 7. be fundamental to 8. a chain action 9. make it possible forto do10. give birth to 11. prevent from 12. millions of years to comeVI.Understanding.a.Match the phrases underlined with their correct meaning.1.They were in time to produce carbon, nitrogen, water vapour and
6、 other gases.2.They multiplied and filled the oceans and seas with oxygen.3.Carbon dioxide prevents heat from escaping from the earth.4.It was not immediately obvious that water was to be fundamental to the development of life.A. increase in number B. importantC. stop/keepfrom D. after a long period
7、 of timeb.Try to find a sentence that can be replaced by the following one: Now its their turn to be the most important animals on the planetc.Translate the following sentence.1.It was not immediately obvious that water was to be fundamental to the development of life.2. That made it possible for li
8、fe to begin to develop.Vii,Key words .explode1). vt.vi（使某物）炸开，爆炸 ；炸弹，火药）爆炸2). （指感情）激发 +with anger 勃然大怒3). （指人口）突然或迅速增加 翻译iThe firework exploded in his hand and he was hurt seriously. iiI was frightened when she exploded into loud laughter. iiiNow it is not easy to find jobs with the exploding popula
9、tion.explosion n. 爆炸（声） explosive adj.爆炸性的，易爆炸的 n.炸药，爆炸物 cool adj.凉快；冷静；冷淡 v. （使）变冷；冷静下来 =calm / settle down 翻译. 1) I knew I had to keep cool. 2) The rain has cooled the air. 3) Let your soup cool a little before you drink it. 4) A heated argument can be settled better if both sides cool down first.
10、 5) I tried to cool her down but she was still very angry when she left. multiply (数目上)增加，增多；乘；（使）繁殖 1) Our problems have multiplied since last year. 2) 2 and 5 multiply to make 10. 3) A by B or A and B together 6 multiplied by 5 is 30.One can make 12 by ing 2 and 64) The plants here multiply rapidl
11、y. encourage 鼓舞；促进；怂恿。后接名词、代词，也可接不定式作宾语补足语。翻译High prices for corn and wheat will encourage farming. My success encouraged me to continueHe encouraged me to learn dancing.V.spreadvi. 散布, 传播，蔓延=get around； 伸展，扩展 ，vt.1) The news spread through the school very quickly. 2) Theres a desert spreading for hundreds of miles. 3) He spread out his arms to welcome us. 4) I spread a new cloth on the table.