题目

设函数f(x)=2x+3,g(x+2)=f(x),则g(x)的解析式是() (A)g(x)=2x+1    (B)g(x)=2x-1 (C)g(x)=2x-3    (D)g(x)=2x+7 答案：B解析:因为g(x+2)=f(x)=2x+3, 所以令x+2=t,则x=t-2,g(t)=2(t-2)+3=2t-1. 所以g(x)=2x-1. We have come to the ________ that it would be unwise to accept his idea． [　　] A． suggestion B． conclusion C． plan D． promise