人教版高中英语选修六：Unit4教案+(5)

高中英语讲义

英语学习讲义seeing some pictures)

3). What’s the difference between wind power and coal power?

Wind will never run out while coal is a limited source.

2. Let Ss talk something about thenegative effects of using energy and then know about the global warming.

3. Let Ss know more about the global warming by comparing with the greenhouse.

1.) What is the greenhouse made and used for?

A greenhouse is made of glass and is used for growing plants, especially during cold weather.

2.) How does it work?

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.) What are the “greenhouse gases”?

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). What do you think greenhouse gases do?

They trap heat from the sun and therefore warm the earth.

(This part enable students to know and think more about what is global warming by looking at some pictures and answering some questions. During this part, at first, students can learn some words about the topic and then have a few minutes to think about the pictures and questions. At last, them can show their own thoughts and answers.)

Step III Discussion: Should we do nothing about global warming?

Divide the class into two groups.

好好努力梦想终会实现 5