题目

What did the man think caused most accidents?A.Driving too fast. B.Getting up too late. C.Drinking too much. 答案：【答案】C【解析】【原文】W: You are driving too fast.M: I got up too late. I’m in a hurry.W: But you’ll have an accident. Most accidents are because people are in a hurry.M: Really? I thought drunks caused most accidents.已知函数在处取得极小值． （Ⅰ）若函数的极小值是，求； （Ⅱ）若函数的极小值不小于，问：是否存在实数k，使得函数在上单调递减.若存在，求出k的范围；若不存在，说明理由.