入煎剂用量较大，需打碎先煎的药（）
A.麝香
B.石菖蒲
C.琥珀
D.牛黄
E.磁石
参考答案：E
Jack has gone to Australia, but I'm wondering why he ______ in such a hurry. [ ]
A. left
B. has left
C. leaves
D. was leaving
上颌窦（）
A.在上颌骨体内
B.窦顶为额骨眶部
C.底与尖牙关系密切
D.窦口低于底部
E.开口于下鼻道
