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2.正确理解并朗读课文。
教学难点：
1.三会单词的掌握。
2.use…to?和?should的用法。
教学具准备：
光盘单词卡片，课文图片，PPT
教学过程：
Step 1:Enjoy a story
1.《A mother and her son》
讲故事过程中教授：Coal、oil、wood
2.（出示地球图片）Mother Earth地球母亲
T:We have only one Earth.Let’s protect the Earth!
揭示课题：Protect the Earth
Step 2：Green Guards Needed:招募绿色环保小卫士
Task 1. Try to know four ways to protect the Earth.
1.快速浏览课本P68，找出保护地球的四种方法。
2.Choose one title for each picture (为每幅图选一个主题）.
A:Save water B: Save energy
C:Save trees D:Don’t use too much plastic
（出示饼图）Energy used in China
70% coal 18% oil
Most of（大多数）our energy comes from coal and oil.
3.Energy comes from__________ too.
介绍其他能源（wind energy、water energy、solar energy、nuclear energy）
Task 2. Try to know the use (用处) of them.
1.Watch the cartoon and find out the use of them.
We use water to A. make things and help keep the air clean
We use energy to B. drink and clean
We use trees to C. make bags and bottles
We use plastic to D. drive cars