条痕为白色的药材有：（）
A.石膏
B.炉甘石
C.滑石
D.芒硝
E.HgS
参考答案：A, B, C, D
The reason ____ he hasn’t come is ____ he has to look after his father.[ ]
A. that; because
B. why; because
C. why; that
D. which; because
社会保障基金的筹措方式包括（）
A.财政拨款方式
B.征税方式
C.征费方式
D.自由筹资方式
E.强制储蓄方式
