题目

Mr Smith was a wealthy industrialist, but he was not satisfied with life. He did not sleep well and his food did not  21   with him. The situation lasted for some time. Finally, after a   22   of sleepless nights, he decided to consult his doctor. The doctor advised a change of  23  . “Go abroad,” he said, “But I’m not good at foreign languages,” said Mr Smith. “It doesn’t matter,” said the doctor. “It won’t   24   you to talk a little less. Go on a voyage. Take plenty of exercise. Try to reduce your weight,  25   rich food.”        Mr Smith went to下列说法正确的是（ ）A.淀粉、蔗糖、油脂的水解产物都是葡萄糖B.可以用盐析和变性来分离提纯蛋白质C.F、Cl、Br、I的氢化物的稳定性随核电荷数的增大而减弱D.酸性氧化物在常温下均为气态