枳壳药材果皮顶端的花柱残基，该特征是（）
A.皮松肉紧
B.皮刺
C.尖蒂
D.吐脂
E.白瓤
参考答案：C
— Could I have the small table by the window?
— Sorry, sir. It ______ in advance.
A．booked
B．will be booked
C．had booked
D．has been booked
分火头是否击穿，拔下来时怎样判断？
