黏液腺囊肿好发于（）
A.上唇
B.下唇
C.上颌骨
D.下颌骨
E.颧骨
参考答案：B
At the foot of the mountain_____. [ ]
A. a village lies
B. lies a village
C. does a village lie
D. lying a village
无限航区航行的货船，全船配备的救生艇乘员总数应为全体船员数的：（）
A.100%
B.200%
C.50%
D.250%
