葡萄胎排空后随访时最重要的检查项目是（）
A.B型超声检查
B. * * 脱落细胞涂片检查
C.盆腔内诊检查
D.X线胸片
E.血HCG检查
参考答案：E
—Excuse me. Can I take the summer English course?
—Yes. But the course _____ before it starts. [ ]
A. can be paid for
B. can pay for
C. must pay for
D. must be paid for
呃逆的主要发病机制是（）
A.胃气郁滞，失于和降，不通则痛
B.肝气犯胃，胃失和降
C.中焦气机不利，脾胃升降失职
D.胃失和降，胃气上逆
E.胃失和降，上逆动膈
