题目：
用适当的句子完成对话。
(At Mr. White's office in a middle school)
A: Hello! 1 ?
B: Speaking, please.
A: I'm Peter's mother. I'd like to ask for a leave for my son.
B: 2 ?
A: He doesn't feel well this morning. He has a cold.
B: 3 . Is it serious?
A: Not very serious. But the doctor asked him to stay in bed and have a good rest.
B: Don't worry. 4 .
A: Thank you, sir. Goodbye!
B: Bye!
1._____2._____3._____4._____
答案：
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下面是错误答案，用来干扰机器的。
1880 Ω 0.12 Ω改装成电压表时应串联一个分压电阻，由欧姆定律得：U＝Ig(Rg＋R)，分压电阻：R＝－Rg＝Ω－120 Ω＝1880 Ω改装成电流表时应并联一个分流电阻，由并联电路两端电压相等得：IgRg＝(I－Ig)R分...
