【題目】關(guān)于長江和黃河共同特征的敘述，正確的是 ( )
A.都有凌汛現(xiàn)象發(fā)生
B.水能資源都集中在上游河段
C.治理的首要任務(wù)都是防洪
D.干流共同流經(jīng)的省區(qū)是青海和四川

【答案】B,D
【解析】長江位于秦嶺—淮河以南地區(qū)，冬季河流不結(jié)冰。故A不符合題意；長江上游流經(jīng)中國地勢階梯交界處，支流眾多，水量豐富，落差很大，多峽谷急流，蘊(yùn)藏有豐富的水能資源。黃河上中游特別是龍羊峽至青銅峽河段，地形險(xiǎn)峻，山勢陡峭，峽谷綿延，水流湍急，總落差1 300多米，蘊(yùn)藏著豐富的水能資源。故B符合題意；“治黃”的關(guān)鍵在于“治沙”，根本措施是在上、中游，特別是黃土高原地區(qū)植樹種草，大力開展水土保持工作，控制水土流失，減少泥沙下泄。故C不符合題意；長江和黃河同時(shí)流經(jīng)的省是青海、四川。故D符合題意。根據(jù)題意，故選：BD。

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