【金版新学案】2013-2014学年高中英语选修6同步辅导与检测：Unit4Globalwarming第一学时.ppt

第一学时　Reading and Comprehension;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;Task 2;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;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 the levels of carbon dioxide have increase or not over the years ;4．“But there are some very different attitudes among scientists towards this issue.” “Issue” here means the same as the one in“________”． A．I bought the new stamp the day of its issue B．This is a big issue；we need more time to think about it C．She is always on a diet——she has issues about food D．The magazine has 12 issues each year;5．What may happen if we do nothing about global warming? （ ） A．There may be a rise of the sea level. B．The temperature will surely be lower. C．The“greenhouse effect” will disappear. D．It has nothing to do with us.;Task 3;When we 4.______ huge quantities of extra carbon dioxide into