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学习方法：
教师点拨，学生自主学习，合作探究，掌握重点结构。
学习重点：
plenty of， be bad for，stay healthy，cause， allow sb. to do sth， encourage sb to do sth
学习难点：
Why is smoking harmful?
How to stay healthy?
五、学习流程：
Step1：Greetings.
Step2:Lead-in:
Look at the video and pay attention to the content.
Step3:Show Studying aims:
Step4:Learn the new words(read the new words and listen to the record to check)
smoke harmful
disease lung
harm breathe
public law
cigarette whenever
risk somebody
Step5:Listen to the text and fill in the chart
Harmful effects of smoking
*Smoking is bad for your ( ).
It can cause( ) of the heart and lungs.
* Smoking ( ) the environment.
* Second-hand smoke is ( ) to people who don't smoke.
Advice to stay away from cigarettes
* Never ( ) cigarettes.
* When somebody talks about smoking,change the ( )
*( ) your family members to stop smoking.
* Eat more fruits and ( ) .