“假设海岸A与海岸B之间相距3000米,小明要从A点到B点,他可以选择哪些交通方式呢?”科学老师提问。同学甲:小明可以从跨海大桥上走过去。同学乙:小明可以从海底隧道穿过去。同学丙:小明可以乘船从A到达B。“可是,如果这片海面上并没有 ”Suppose the distance between coast A and coast B is 3000 meters, and what kind of transportation he can choose from point A to point B?“ Asked the science teacher. Classmate A: Xiao Ming can walk over the bridge across the sea. Class B: Xiao Ming can cross the Cross Harbor Tunnel. Class C: Xiao Ming can be reached by boat A from B. ”But if this piece of the sea does not have