单选题
Which of the following statements is NOT considered the valid reason for the disappearance of black slavery in the American North in the early 1800s?
A、
The price of slaves was too high.
B、
Slavery was simply illegal in the North.
C、
The Africans could not stand cold winters in the North.
D、
As the North turned toward industry, mechanics and not farmhands were needed.
【正确答案】
B
【答案解析】
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