题目

_____ the wind and the rain, I still enjoy working outside in the world. A . By B . Except C . Through D . Despite 答案：D如图所示，圆柱体ABCD中，AB=3，AD=4π，现用一根绳子从A点绕圆柱体一周连接到D点，则这根绳子的最短长度为________．