题目

Tom arrived at the bus station quite early for Paris bus. The bus for Paris would not leave until five to twelve. He saw a lot of people waiting in the station. Some were standing in line（排队）, others were walking around. There was a group of schoolgirls. Their teacher was trying to keep them in line. Tom looked around but there was no place for him to sit. He walked into the station cafe（咖啡馆）. he looked up at the clock there. It was only twenty to twelve. He found a seat and sat down before a large mirror（镜子） on the wall. Just then, Mike, one of Tom’s workmates came函数在区间上的最大值是            ．