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【单选题】Water Resource Humanity uses a little less than half the water available worldwide. Yet occurrences of shortages and droughts (干旱) are causing famine and distress in some areas, and industrial and agr...
A.
build big lakes to store water
B.
construct big pumping stations
C.
build small and cheap irrigation systems
D.
channel water from nearby rivers to cropland
【单选题】霍林河发源于大兴安岭，为山前半干旱区及部分半湿润区的平原带来了流水及泥沙。受上游修建水库和灌溉的影响，山前平原河段多年断流。断流期间，山前平原上的洼地不断增多增大。据此完成9～10题。修建水库前，营造该地区山前平原地表形态的力主要来自( )。
A.
构造运动
B.
风
C.
冰川
D.
流水