单项选择题

They attribute their success to their teacher's_______.

A.enjoyment
B.attachment
C.encouragement
D.assignment
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单项选择题
This country （）more obese people than underweight ones.

A.is having
B.has had
C.has
D.have
单项选择题
x→1时，sin(x)／(1－x^2)的极限是()。
A.1
B.0
C./2
D.1/2
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