The author says that in some hot and dry areas it is advisable to ______.
A.
build big lakes to store water
B.
construct big pumping stations
C.
channel water from nearby rivers to cropland
D.
build small and cheap irrigation systems
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【单选题】有以下程序#include void main( ){ int a = 12, b = -34, c = -56, min; min = a; if(min > b) min = b; if(min > c) min = c; printf("min = %d", min);}输出结果是( )。