题目

导数或瞬时变化率反映函数变化的什么特征？ 答案：答 导数或瞬时变化率可以反映函数在一点处变化的快慢程度．— Do you want a lift home? — It's very kind of you, but I have to work late in the office. I overslept this moming because my alarm      clock _____. [     ]A. doesn't go off B. won't go offC. wasn't going off D. didn't go off