题目

Come here, Kate. I have ______ nice to show you.         A. something         B. anything            C. nothing             D. everything 答案：A设f（x）＝2x3，g（x）＝f（x+2），则g（x）等于（ ）A.2x＋1B.2x－1C.2x－3D.2x＋7