Fair and (73) competition in government procurement around the world is good business and good public policy．Competitive pricing，product (74) and performance improvements result from competitive practices and help ensure that government authorities get the best (75) for the public they serve．

A．open

B．continue

C．dependent

D．reliable

药物是人类抵御疾病的重要武器之一。下列有关药物的说法不正确的是（   ）

A．“胃得乐”（主要成分为碳酸镁）是一种抗酸药

B．“阿司匹林”是一种重要的抗生素

C．青霉素能抑制细菌细胞壁的生长，致使细菌因细胞破裂而死亡

D．鸦片、吗啡、海洛因等这些物质属于毒品