胃酸明显减少常见于（）
A.胃溃疡
B.十二指肠溃疡
C.胃癌
D.胃泌素瘤
E.幽门梗阻
参考答案：C
These story books for children are awfully written. They _____ are interesting_____ exciting. [ ]
A. either; or
B. neither; nor
B. both; and
D. not only; but also
用异烟肼治疗结核病时，应加服（）
A.维生素A
B.维生素D
C.维生素C
D.维生素B6
E.维生素K
