浙江象山中学高中英语Unit4AstronomyWarmingupandReading导学案无新人教必修3.doc

Unit4 Astronomy Warming up and Reading 学习目标1.知识与技能学会天文学方面的一些表达,了解地球上生命的起源。

2.情感态度与价值观关注地球,重视保护环。热爱科学、尊重科学。

重点难点讨论和学习地球上生命的起源问题,培养学生的阅读能力。

学法指导讨论、成果展示、略读、跳读。

自主学习 1. 重点词汇Astronomy atmosphere system Violent solid explode Carbon dioxide oxygen surface Planet harmful spread 2. Warming up Q1 Which astronomers do you know ____________________________________________. Q2 In our solar system 8 planets circle around the sun. What are they ____________________________________________. Q3 How much do you know about the universe What are they ______________________________________________________________. 3. Fast reading Read the text quickly and write down the main idea for each paragraph. Paragraph 1___________________________________________________ Paragraph 2;
__________________________________________________ Paragraph 3 ___________________________________________________ Paragraph 4 ___________________________________________________ Paragraph5 ____________________________________________________ 我的疑惑 ______________________________________________________. 合作探究 Detail reading Read the text carefully and answer the following questions 1. Put the order of development of life into time line. 1 A . Insects and amphibians appeared. 2 B. Dinosaurs appeared. 3 C. The earth became a solid ball. 4 D. Small plants grew on the water. 5 E. Reptiles appeared. 6 F. Plants began to grow on dry land. 7 G. The earth was a cloud of dust. 8 H. Water appeared on the earth. 9 I. Shellfish and other fish appeared. 10 J. The universe began with a “Big Bang“. 11 K. Clever animals with hands and feet appeared. 12 L. Mammals appeared. Order___________________________________________________ 2. 1. Why was the earth different from the other planets ________________________________________________ 2. Why did the plants grow before the animals came _________________________________________________ 3. Why is it wrong to show films with dinosaurs and people together _________________________________________________ 4. What problem is caused by human beings __________________________________________ 能力提升 Summary After the “Big Bang”, the earth was just a cloud of dust. It _________ loudly with fire and rock, which were ____ ___________to produce the water vapour, ___________ and other gases. Then small plants grew. They ___________and filled the oceans and seas with oxygen. Many millions of years later the first green plants began to ________on land. When the plants grew into forests,________ appeared for the first time. They produced young generally by _________eggs. When dinosaurs disappeared, __________ became more important. Now small clever animals with _____________appeared and ________all over the world .As time ________ they covered the earth and they are putting too much carbon dioxide into the __________, which ________ heat ____ ________ from the earth into space. Whether life will continue on earth for millions of years to come will _____________whether this problem can be solved. 随堂小测 1. What began to appear on the earth’s surface when it cooled down A. water B. gases C. heat D. carbon 2. From the Last paragraph we can infer that the author is ____. A. confident B. sad C. concerned D. angry 3. How many years did dinosaurs exist on the earth A. More than 140 billion years. B. More than 140 million years C. More than 140 thousand years D. More than 140 years