Step 1 复习（2分钟）
1.检查上课时家庭作业。
2.师生问答，复习上节课知识点。
T：What do you want to be when you grow up?
S:I want to be an officer（公务员）.
T: How are you going to do that?
S:I am going to study politics（政治）.
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