单项选择题

It is widely accepted that young babies learn to do things because certain acts lead to re-wards .

A．pay
B．prizes
C．awards
D．results
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单项选择题
Many new chanceswill be opened up in the future for those with a university education.
A．opportunities
B．realities
C．necessities
D．probabilities
单项选择题
The attack on Fort Sumter near Charleston provokeda sharp response from the North, which led to the American Civil War.
A．demanded
B．elicited
C．extracted
D．defied
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