Everybody has responsibility to save water, if future generations are to enjoy similar standard of living to the one we enjoy now.
A. the; /
B. a; a
C. /; the
D. a; the
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(答案→)A. the; /
B. a; a
C. /; the
D. a; the
解析：第一空特指“节水的责任”；第二空泛指“生活水平”。故选A。句意：每个人都有节水的责任，如果子孙后代也能享受我们现在的生活水平。