Being a teacher, you must observe your behavior, for ________ you say and do has a life-long effect on your students.

A．that

B．which

C．what

D．as

根据我国招标投标法的明确规定，为保证原有咨询服务项目前后一致性或者服务配套的要求，需要续聘原咨询单位，但所需费用不超过前项咨询服务合同金额( )的，可以采用直接谈判方式选聘咨询单位。

A．7%

B．8%

C．9%

D．10%