—What’s wrong with you, Ann?

—My mother is ill. I have to        her at home.

A．look at

B．look for

C．look after

D．look around

把一堂美术课所要传授的知识、技能训练等内容，按照教学过程及特点组织起来，安排好前后顺序就是（）。

A.钻研教材

B.组织教材

C.拓展教材

D.运用教材