切粒机停止后，在清理切刀室时要注意避免（）。
A、磕碰定刀
B、磕碰动刀
C、定刀和动刀之间磕碰
D、切刀转动
参考答案：C
— She looks very happy. She ____ have passed the exam.
— I guess so. It's not difficult after all. [ ]
A. should
B. could
C. must
D. might
结合教学实际，谈谈怎样培养与激发学生的学习动机
