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    【题目】关于长江和黄河共同特征的叙述，正确的是 ( )
    A.都有凌汛现象发生
    B.水能资源都集中在上游河段
    C.治理的首要任务都是防洪
    D.干流共同流经的省区是青海和四川

    【答案】B,D
    【解析】长江位于秦岭—淮河以南地区，冬季河流不结冰。故A不符合题意；长江上游流经中国地势阶梯交界处，支流众多，水量丰富，落差很大，多峡谷急流，蕴藏有丰富的水能资源。黄河上中游特别是龙羊峡至青铜峡河段，地形险峻，山势陡峭，峡谷绵延，水流湍急，总落差1 300多米，蕴藏着丰富的水能资源。故B符合题意；“治黄”的关键在于“治沙”，根本措施是在上、中游，特别是黄土高原地区植树种草，大力开展水土保持工作，控制水土流失，减少泥沙下泄。故C不符合题意；长江和黄河同时流经的省是青海、四川。故D符合题意。根据题意，故选：BD。

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