How Life Began On The Earth导学案How Life Began On The Earth导学案
高一英语必修三第四单元导学案 unit 4 asrtonomy: the science of the stars第一课时 how life began on the earthlearning aims:master the key words and expressions of the text.read and understand the text—how life began on the earth课前预习(resivion)：preview new words and expressions:words:1. violent adj.强暴的，猛烈的violence n.暴力，强暴；猛烈 violently adv. 强暴地；猛烈地2. fundamental adj.基本(础)的n.[pl.]基本原则(法则) fundamentally adv. 基本地；根本地3. development n.生长，发展；新情况 develop vt.发展；产生vi.生长；发展developed adj. 发达的developing adj. 发展的4. lay vt.放下；摆设；产(蛋) lay-laid-laid-laying lie vi. 躺，平放；位于lie-lay-lain-lying lie n.&vi. 谎话；说谎 lie-lied-lied-lying5. prevent vt. 预防，防止 prevention n.预防；阻止；妨碍 preventable adj.可防止的，可预防的expressions:1. to begin with 2. in time 3. in one’ s turn 4. prevent...from 5. give birth to 课堂阅读（procedures）：task 1: fast readingskim the passage and find out the main idea of the text.the main idea task 2: careful reading1. analyse the structure of the passage. write down the main idea for each paragraphparagraph 1:paragraph 2:paragraph 3:paragraph 4:paragraph 5:2.answer the followindowsg questions:(1) after the big bang, what happened?(2) what happened next?(3) what did the water vapour and gases form?(4) what appeared on the earth then?(5) what did the water do? 3.put the order of development of life into a timeline. use the reading passage to help you. (1) insects and amphibia ns 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 earth.共2页，当前第1页12How Life Began On The Earth导学案
9 shellfish and other fish appeared.10 the universe began with a “big bang”.11 clever animals with hands and feet appeared.12 mammals appeared.task 3 post readingfill in the blanksfinally about 2.6 million year s ago some small ______ animals, now with hands and feet, appeared and _______ all over the earth. _____ they have, _______, become the most important animals on the planet. but they are not _____ the earth very well. they are putting too much _______ into the ______, which ______ heat _____ escaping from the earth into space. ____, many scientists believe the earth may become too hot to live on. so _______ life will continue on the earth for millions of years to come will ______ whether this problem can be solved. 讨论（discussion） how can we protect the earth and make it a better place to live on?家庭作业（homework）read the text.review the new words and expressions. 共2页，当前第2页12推荐站内搜索：网考成绩查询、中秋节日记100、山西自考准考证打印、四六级成绩查询入口、自学考试网、黑龙江自考成绩查询、江西自考所有成绩查询、成人高考录取查询、原来如此作文福建省专升本官网、
