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．help

B．server

C．value

D．policy

蕈类又称蘑菇，属于真菌植物。在我国目前已鉴定的蕈类中，可食用蕈近300种，有毒蕈类约（）多种；其中含剧毒可致死的不到（）种.

A.100；10

B.200；30

C.50；20