单项选择题

A. The slavery issue was solved at1861. B. The slavery issue was solved at1863.
C. The slavery issue was solved at1864. D. The slavery issue was solved at1865.
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单项选择题
A. Social progress will have two main economic consequences.B. Technological progress will have two main economic consequences.C. Human progress will have two main economic consequences.D. Equipment progress will have two main economic consequences.
A. Social progress will have two main economic consequences.
B. Technological progress will have two main economic consequences.
C. Human progress will have two main economic consequences.
D. Equipment progress will have two main economic consequences.
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