百部的药用部位为（）。
A．块根
B．块茎
C．根茎
D．鳞茎
E．根及根茎
参考答案：A
I would appreciate ____ it a secret. [ ]
A. your keeping
B. you to keep
C. that you keep
D. that you will keep
鼻咽癌的发病与哪种维生素有关（）
A.维生素A
B.维生素B
C.维生素C
D.维生素D
E.维生素E
