九年级上册（2014年7月第1版）《Section C》公开课教案下载-焦作市优质课

过

程学 案导 案以课文图片导入自学检测洞 ________形成______形式 _____ 上升______

take away________ oxygen______

ozone layer________ radiation_______ directly____ carbon dioxide_________ blanket______ escape________

the greenhouse effect____________

refer to _____________借助图片可以熟悉新单词的读音和基本意思

合作探究1. 借助1a中的图片，创设情景，导入新课

2. (让学生快速阅读1a，用所给的词组填空。完成1a。)

3. 回答下面的问题

(1) Have we changed our planet in many ways?

(2) Have people done good to the earth?

(3) Why are more and more sorts of animals and plants disappearing?

(4) Are many rivers and lakes dead now?

(5) Is ozone important to the earth? Why?

(6) Has carbon dioxide in the air increased a lot?

4.让学生再次读1a，完成1b的几个问题，处理课文的在知识点

5. (让学生两人一组讨论，完成下面的表格。

Problems

Effect

6. 使学生了解各种污染对地球环境的影响，培养他们的环保意识。交流解疑1.Some things we’ve done are very good for the earth while some are not good. ____________________________

while , _______。表示_____________关系， 相当于 but.

while还可用作从属连词，意为____________________ ，表示两个动作_______-进行,常常用于进行时态（现在和过去进行时态）。例：

While I was doing my homework, my mother was cooking.

while 还作名词，意为 “一会儿”

例:We are going away for a while.

2. When it rains or when the wind blows, the earth is taken away.

take away _____

I don’t like these books, please take them away.

3. As a result, many rivers and lakes are dead.

记住几个单词： dead ____ die ___ death ___ dying ___