题目

读我国江南丘陵某地区等高线图(下图，单位：米)，回答问题。 图幅内河流干流流向为（     ）     A．自北向南    B．自南向北       C．自东向西    D．自西向东 答案：DThe place _____ the bridge is supposed to be built should be _____ the cross-river traffic is the heaviest.A. which; where B. where; in whichC. in which; where D. in which; in which