7.参考答案B说明分析圆x2+y2-4x+4y+7=0的标准方程为(x-2)2(y+2)2=1,则圆心C的坐标为(2,-2),半径为1.由点P在直线L:x-y+1=0上,可设点P(x,x+1),则PQ|=PC|2-2=(x-2)2+x+1-(-2)-1=v2x+2x+12≥√6所以线段PQ的长度的最小值为

第三部分写作第一节One possible version:Dear Sir or madamI'm writing to apply for the job as a clerk at your charitablefoundation i think it is a good chance to improve myself.I think I' m quite qualified for the job. Firstly, I am crazy aboutEnglish and have a good command of English. Besides, I have apassion for writing, which is also my strength. Last but not least, I'moutgoing and good at communicating with others.I do hope I can get the job. Looking forward to your replyYours tr山ly,Li Hua

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