Unit4Reading（Howlifebeganontheearth）导学案- 高中英语人教新课标必修三.doc

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1、M2 U4 Warming up-Reading:How Life Began On The Earth学案内容课前预习:Please turn to page 25-27, and finish the following tasks.自主学习: I.Lead-in &.Pre-reading-Free talk （Dont be shy大胆说出口！）1. (查阅下列词汇,并正确读出来)Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune, theory, atoms, billlion, globe, carbon dioxide,

2、atmosphere, fundamental, acids,chain, oxygen, amphibians, reptiles, dinosaurs, mammalsII.While-Reading(p26)（阅读文章完成下列任务） Fast Reading:Task 1:(回答以下问题)1. The passage is developed by ( ) A. time B. place C. space 2. The text mainly tells us the _ of the earth and the _ of life on it.Task 2: Matching（匹配每

3、个段落大意） Para. 1 A. The formation of the earth. Para. 2 B. The importance of water for life. Para. 3 C. A widely accepted theory about the formation of the universe. Para. 4 D. The arrival of humans and their impact on the earth. Para. 5 E. The development of plants and animals on the earth.把课文分成俩部分该怎

4、么分？Part 1: Part 2: Task 3: Supporting details . 1.What began to appear on the earths surface when it cooled down? A. Water. B. Gases. C. Heat. D. Carbon.2. How did the atmosphere on the earth appear? A. It came from space. B. It came from the explosion. C. It came from the oceans. D. It came from th

5、e forests.3.Why was the earth different from other planets?A. It produced a lot of heat. B. The water remained. C. Water disappeared. D. It was the oldest planet.4. Why was it necessary for plants to grow before animals? A. Animals needed plants to protect them from the sun. B. Plants provided oxyge

6、n for animals to breathe. C. Animals could hide from hunters in the forest. D. It was easier for plants to grow.5.According to the passage we can know_A. only the earth has life on it in space B. oxygen is the atmosphere on the earth came from the“Big Bang”C. humans are the cleverest animals on the

7、earth D. plants played an important part in the appearance of the animalsCareful Reading: Task 1:Read para1-3 and fill in the blanks.(3mins) How did the earth come into being(产生)?Big Bang a cloud of a solid exploded loudly with and the earths the earth water Task 2:Read part 2 and finish the flow ch

8、art.(3mins)Small in water and all sorts of fishgreen plants on on land and amphibiansForests , dinosaurs, , small clever animals.Group work:Work with your group mates and put the events into a timeline.(和队友根据时间线排序)(3mins)1. Insects and amphibians appeared. 2. Dinosaurs appeared.3. The earth became a

9、 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 earth.9. Shellfish and other fish appeared. 10. The universe began with a “Big Bang”.11. Clever animals with hands and feet appeared. 12

10、. Mammals appeared.SummaryThe earth was just 1._cloud of dust after the “Big Bang”.The earth exploded loudly with fire and rock. They were 2._ time to produce many things, which were to make the earths atmosphere. As the earth cooled down, water began to appear on its surface. It allowed the earth 3

11、_(dissolve) 4._ (harm) gases. Then life began to develop.The first small plants multiplied and filled the oceans and seas with oxygen. This encouraged the 5._ (develop) of early shellfish and fish. Land animals such as insects, reptiles and dinosaurs appeared after green plants 6._(appear). Small cl

12、ever animals spread all over the earth. They are putting too much carbon dioxide into the atmosphere, 7._ prevents heat from 8._ (escape) from the earth into space. 9._ life will continue on the earth for millions of years to come will depend on whether this problem can 10._(solve)Post-Reading: What

13、 problem is caused by human beings?(Last paragraph） Discuss: What can we do to protect the earth and make it a better place to live on?(5个为一组，选取组长上台做个小报告)线索：solar energy, air, land, forest, transportation, water. V. Conclusion.Only if we care will we help;only if we help shall all be saved!Whether life will continue on the earth depends on human beings.VI.Homework1.Collect more information about the development of life and make a poster with your group members.2.Write a composition about how to stop globe warming.3