题目

如图，在河岸上用细绳拉船，使小船靠岸，拉绳的速度为v，当拉船头的细绳与水平面的夹角为θ时，船的速度大小为_________。  答案：v/cosθ解析:略 His life is too boring. He _____ some time with his friends.     [     ]A. doesn't need spending               B. needn't spendC. needs to spend                     D. needed spending