涎石病最常见于（）
A.舌下腺
B.颌下腺
C.磨牙后腺
D.腮腺
E.腭腺
参考答案：B
Of millions who have watched the Gangnam Style video, there are a growing number of celebrities ________ their love for the song.
A．expressing
B．to express
C．express
D．will express
上消化道出血量达到多少时可产生黑便（）
A.5ml
B.60ml
C.30ml
D.100ml
E.200ml
