抗酸药的药理作用是（ ）
A．中和胃酸
B．抑制胃酸分泌
C．促进血液循环
D．导泻
答案：A
新闻写作的基本要求有哪些？
The man in black was about to set fire to the house ____ the police came.
A．while
B．after
C．before
D．when
