Step 1情景导入
T:Have you known how green you are?
S1:Yes.
T:What do you do to protect the environment?
S1：I always turn off the lights when leaving, collect waste paper and take my own bag when going shopping.
T:Good. You are greener. What about the others?
S2:I don\'t throw away the old clothes and give them to the persons who need them.
S3:I walk to school instead of taking a bus or car.
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