口疮主要病位在（）
A.心
B.肝
C.脾
D.胃
E.肾
参考答案：A, C, D, E
Sandy often takes her dog for walk around the lake after supper. [ ]
A. a
B. an
C. the
D. 不填
肺上沟瘤的X线表现有哪些?
