易发生穿透或穿孔的溃疡是（）
A.复合性溃疡
B.球后溃疡
C.巨大溃疡
D.老年人消化性溃疡
E.幽门管溃疡
参考答案：C
接触式密封有()、()和()
— They have a lot of rules at their house.
— [ ]
A. So do I.
B. So we do.
C. So have I.
D. So I have.
