磁石的功效是（）
A.镇惊安神
B.收敛固涩
C.聪耳明目
D.平肝潜阳
E.纳气平喘
参考答案：A, C, D, E
—There aren't enough snacks for the party. Did you buy ______?
—No, I didn't. I bought everything they had in the shop. [ ]
A. little
B. less
C. more
D. most
淬火时，油的冷却速度高于水。（）
