下列关于招标文件的基本要求，说法错误的是( )。

A．合同包的界面完整、清晰、准确、合理
B．清晰、完整、准确地体现招标人的效率观
C．评标规则标准、明确、客观、公正、可操作性强
D．技术及商务条款既适合业主的要求又能形成适度的市场竞争

Most psychologists deeply believe that it is just______difficult to change a person's way of thinking as it does to rectify his deep-rooted habits.

A．as

B．than

C．so

D．more