FG审题指导理解用户的用电器是并联关系是关键,抓住电网的电压不变,运用变压器及闭合电路的基本知识解答。解题思路用户的用电器是并联关系,当用户的用电器增加时,R接入电路的阻值减小,选项A错误;电网电压不变,则V与V示数都不变,R接入电路的阻值减小,A2示数变大,由知A的示数也变大,选项B错误;由闭合电路的欧姆定律有U2=U1+l2R0,V2示数不变,则/44八~R,选项C正确;变压器上的能量损失可以忽略,则C=U即,=元,选项D错误。

【参考范文】To whom it ma concernI am one of your customers. I ordered a set of English short stories on your online store ofAmazon a month ago, but I didn't receive them until yesterday. And much to my disappointmentthe books were so poorly packed up that the package is broken and the cover of one book was tornTo make matters worse, it is not a complete set, for I found one book missingI am sorry to have received such poor service, and I believe I have every right to ask you todeal with this problem. I hope that you either return my money or deliver a new set of books to meBesides, I'd like to be informed of the process of your dealing with my complaintLooking forward to your reply.L

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