—Tom doesn’t like to have long hair.

—Yeah. His hair is shorter than    .

A．Sam and Bill

B．Sam and Bill’s

C．Sam’s and Bill

D．Sam’s and Bill’s

招标师应承担( )义务，不得泄露标底、评标过程等信息。

A．保密
B．主动回避
C．公平竞争
D．接受行业监督管理