实行计划生育是()。
A、家庭的义务
B、丈夫的义务
C、妻子的义务
D、夫妻双方共同的义务
参考答案:D
Many years ago,robots_____to do many things as now. [ ]
A. couldn't
B. can't
C. weren't able
D. be able
人的价值的两个方面是
A.物质价值和精神价值
B.社会价值和个人价值
C.潜在价值和现实价值
D.正价值和负价值