题目

构成膜系结构的重要成分的一组是（）      A．脂肪和固醇    B．  VD和磷脂      C．蛋白质和胆固醇    D． 磷脂和胆固醇 答案：DYour suggestion _________ a reasonable one. A. sounds like        B. sounds as if　　C. sounded as        D. is sounding like