金版新学案13-14英语(人教版)选修6课件：Unit 4 第1学时.ppt

第一学时　Reading and Comprehension Global warming 1．What is the greenhouse made of and used for? 2．How does it work? 3．What are the “greenhouse gases”？ 4．What do you think greenhouse gases do? 1．A greenhouse is made of glass and is used for growing plants，especially during cold weather. 2．The air inside is warm because the glass traps the heat from the sun and keeps it from escaping.This makes the greenhouse heat up and so the plants can grow throughout the cold period. 3．In the atmosphere surrounding the earth there are gases，which are called“greenhouse gases”， including carbon dioxide，methane(甲烷，沼气) and water vapor. 4．They trap heat from the sun and therefore warm the earth. Task 1 快速阅读课文The Earth is Becoming Warmer —But does it Matter？，用大约30词写出课文的概要。 温馨提示：本文属于说明文，它主要以说明为主要表达方式来解说事物，阐明事理，给人以知识。写概要时要注意说明的对象。(另外这篇文章还包括了人们对全球变暖的这一问题的不同观点。) ________________________________________________ 答案：In the passage，Sophie Armstrong explores the questions on how human activity creates“greenhouse gases”which directly leads to the global warming，and shows us the different attitudes among scientists towards global warming. Task 2 仔细阅读The Earth is Becoming Warmer —But does it Matter？选择正确答案。 1．The text mainly discusses________. A．when the “greenhouse effect” started B．what causes the “greenhouse effect” C．Dr.Janice Fosters theory on the“greenhouse effect” D．the fact that the earth is becoming warmer and different theories about it D 2．All the followings are true EXCEPT________ . A．everyone believes that global warming is caused by human activities B．carbon dioxide is a byproduct of burning fossil fuels C．people accept Charles Keelings data because he took accurate measurements D．not all the scientists agree with each other on the effect of the global warming A 3．The main difference between Dr.Janice Fosters theory and George Hambleys lies in________. A．how to prevent global warming B．what causes global warming C．whether global warming would cause serious problems or not D．whether t