已知△ABC中,AB=AC,则cosB+cosA的最大值为____
— Who will go to the airport to meet Mary?
— I will. I ________ her several times. I can find her easily.
要求:①画:画出修路的最近路线(画在图中);②量:量出李村到公路的图上距离;③算:李村到公路的实际距离是多少米?