—Now that you like the computer so much.Why not buy it?

—Well，I can't afford ________ computer.

A．that expensive a

B．a that expensive

C．that an expensive

D．an expensive that

用考试分数来评价学生的知识和能力水平既有积极意义也有消极意义。结合当前的素质教育，论述教师应如何正确评价和对待学生的考试分数。