题干

下列关于脂质作用的描述,错误的是()

A:磷脂是构成各种生物膜的重要成分

B:脂肪的主要作用是保温和缓冲外界压力

C:维生素D能够促进人体对钙和磷的吸收,所以在补钙的时候需要补充一定量的维生素D

D:性激素能够促进生物体生殖器官的发育以及生殖细胞的产生

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答案(点此获取答案解析)

B

同类题4

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    John and Mary had a nice home and two lovely children. John had just been asked to go on a business trip to another city for several days and Mary would go with him too. They hired a reliable woman to care for their children and returned home a little earlier than they had planned.
    As they drove into their hometown, they found a home on fire. After having a look, Mary said, “Oh well, it isn't our fire. Let's go home.” But John drove closer and said, “That home belongs to Fred Jones who wouldn't be off work yet. Maybe there is something we could do.”
    John noticed an old lady screamed to him, “A children! Get the children!” John grabbed (抓住) her by the shoulder saying, “Get a hold of yourself and tell us where the children are!” “In the basement,” cried the lady.
    In spite of Mary's disagreement, John soaked (浸湿) his clothes and ran to the basement which was full of smoke. He found the door and grabbed two children. As he left he could hear some more cry. He sent the two badly frightened children into the waiting room and asked how many more children were down there. The told him two more and Mary grabbed his arm and screamed, “John! Don't go back! It's dangerous! That house will fall down in any second!”
    But he shook her off and went back. It seemed a very long time before he found both children and started back. As he climbed up the endless steps the thought went through his mind that there was something strangely familiar about the little bodies next to him, and at last when they came out into the sunlight and fresh air, he found that he had just rescued his own children. The baby-sitter had left them at this home while she did some shopping.