高一英语人教版必修三课件 Unit 4 Astronomy the science of the strars-Warming up.ppt

U4 , B3 Astronomy reading 1 导学案 【使用说明与学法指导】 1．自学：20分钟自学25-26页课文（学有余力者可课前完成整份导学案）。 1）先快速浏览课文，把握文章的主旨大意，完成【自主学习】Tasks 1-2。 2）再快读课文1遍，在课文中划出新单词和有用的短语句型。 3）难以理解的句子可参考书本83-85页课后注释以及《金版学案》，仍未解决的要用问号标注出来，等待堂上质疑解决。 【学习目标】 1. 深入理解课文，掌握文章结构，培养快速阅读，整体理解的能力。 2. 通过自主学习，合作探究，学会分析生命发展过程并熟练运用知识点。 3. 本文是科普文章，属于说明文，学会抓住文章要说明的主要问题：地球上生命的起源的几个主要阶段。 * 【自主学习】 Task I Scan the Text “ How life began on the earth” and choose the best answer. 1. From Paragraph 1 we can know that stars are created from ________? A. air B. atoms C. rocks D. ice * B 2. What does the word “they” refer to in the sentences “It exploded loudly with fire and rock. They were in time to produce carbon, nitrogen, water vapour and ...” in Paragraph 2 ? A. Planets. B. Stars. C. Gases. D. Fire and rock. * D 3. Which is the right order of development of life ? A. Small clever animals → shellfish → dinosaurs → mammals. B. Shellfish → dinosaurs → small clever animals → mammals. C. Shellfish → dinosaurs → mammals → small clever animals. D. Dinosaurs → shellfish → mammals→ small clever animals. * C 4. Why are mammals different from other life forms ? A. They give birth to young baby animals and produce milk to feed them. B. They produce young generally by laying eggs. C. They are able to live on land as well as in the water. D. They live on grass. * A 5. What problem is caused by human beings ? A. They exist everywhere on the earth. B. They cause global warming. C. They find new methods of growing crops. D. They enjoy hunting and fishing. * B Task II Read the Paragraph 2, 3, 4 of the text “ How life began on the earth” again and finish the timeline. A Development of Life (1) 1. (Big Bang): The earth was still a cloud of ________. 2. (Between 4.5 and 3.8 billion years ago): The dust settled into a solid ______. 3.(explode): Water vapor and some other gases were produced and made the earth's ____________.