饮片外表面较为粗糙，呈鳞片状剥落的药材为
A．川木通B．秦皮C．石菖蒲D．苦参E．百部
参考答案：D
大圆和小圆各自周长与半径的比值都相等．______．
—Which do you like best, coffee, water or juice?
—____. I only like tea. [ ]
A. Both
B. Either
C. Neither
D. None
