题目

构成细胞膜的重要成分是(    ) A.脂肪            B.磷酸             C.糖类             D.磷脂   答案：D细胞膜的主要成分是脂质和蛋白质，脂质中含量最丰富的是磷脂。   —Excuse me, I’m looking for my umbrella.—Oh, sorry. I took ________by mistake.A. yours B. mineC. hers D. his