题目

阅读理解 Early people lived by hunting animals and gathering grains. After a tribe(部落） had lived in an area for some time, its food supply would begin to reduce. Then the tribe had to move to new hunting grounds where there was more food. This way of life caused special problems for the tribes. They were forced to depend on luck, as well as on their hunting skills. If they could find no game, the whole tribe was in danger of starving. And when the hunters had good luck one day, they were not sure to find game the next time. The tribes moves often because much land was needed to suppo下列关于油和脂肪的比较，错误的说法是（　　）A.油的熔点低，脂肪的熔点高B.油含不饱和烃基的相对量比脂肪少C.油和脂肪都不易溶于水，易溶于汽油、酒精、苯等有机溶剂D.油经过氢化可以转化为脂肪，通常又叫做硬化油