读京杭运河地势剖面图,完成下列各题。1. 图中A为 (河流),调水沿途要建梯级抽水站,主要原因是沿线要经过 (地形区)2. 若该剖面图长度为18厘米,则该图的水平比例尺约为 (按图中所示大运河长度计算)。3. 京杭大运河目前主要承担南下的货物运输是 ,它大大减轻了 (铁路)运输的巨大压力。4. 京杭大运河南北两端工业区分别是 () 37. (2015 •烟台) My deskmate asked me. A. when would I go to the zoo B. whom I would play tennis with C. how did I get home that evening D. whether I have been to Singapore