根据情景选择相应的句子。
（ ）1. 当你和别人交谈，想询问对方的职业时，你应该说：
A. What do you do?
B. What does she do?
C. What does he do?
（ ）2.当你告诉别人你是一名警察时，你应该说：
A. You are a policeman.
B. He is a policeman.
C. I am a policeman.
（ ）3.当你询问对方是否是一名兽医时，你应该说：
A. Is she is a doctor?
B. Is he is a doctor?
C. Are you a vet?
（ ）4. (接第3小题)对方作肯定回答时，他应该说：
A. Yes, he is.
B. Yes, she is.
C. Yes, I am.
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