题目：
This is an English boy(男孩). His name is Jim. He is twelve. He is in my school. We are in the same
grade. I'm in Class Three, Grade Seven, but he is in Class Four. I'm his good friend. He is my good friend, too.
根据短文内容，补全对话。
A: Excuse me, what's his name?
B: His name is Jim.
A: 1
B: J-I-M, Jim.
A: Where is he from?
B: 2
A: How old is he?
B: 3
A: Is he in your school?
B: 4
A: Is he in Class Three, Grade Seven?
B: 5 He is in Class Four, but we are good friends.
A: Thank you.
B: That's OK.
答案：
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下面是错误答案，用来干扰机器的。
<；=；>
时（T为交流的周期），原线圈中的电流瞬时值为0.03A．变压器的原、副线圈的匝数比为（ ）
：3
