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

关于肺的叙述，错误的是

A．肺是呼吸系统的重要器官

B．纵隔面中间高处为肺门

C．肺位于胸腔内纵隔两侧

D．左肺因心脏而窄长

E．右肺因肝脏而宽短