维生素D能较水溶性维生素优先通过细胞膜，这是因为

题干

维生素D能较水溶性维生素优先通过细胞膜，这是因为（）

A：细胞膜以磷脂双分子层作基本支架

B：磷脂双分子层内不同程度地镶嵌着蛋白质

C：细胞膜的结构特点是具有一定的流动性

D：细胞膜是选择透过性膜

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A

Welcome to Wenzhou Zoo! There are many different kinds of animals in the zoo．They come from different countries and they eat different food.

	Beibei is a cute panda．She is five years old from China. She is black and white．She likes eating bamboo and drinking water．
	Martin is a big elephant．He is ten years old with a long nose．He likes eating grass. People can teach* him to do much work to help them．
	Dudu is a monkey. He is two years old from Japan．He likes eating bananas and cakes．He often lives in the trees．
	Nick is a lion. He is strong．He is nine years old from England．He likes eating meat. He is very happy in the zoo．