单项选择题

Very few experts ______ with completely new answers to the world's economic problems.

A．come to
B．come round
C．come up
D．come on
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单项选择题
The findings of the two studies contradict each other, though both groups of scientists have used the same method.
A．agree with
B．confirm
C．complement
D．disagree with
单项选择题
Rejecting the urging of his physician father to study medicine, Hawking chose to ______ on math and theoretical physics.
A．impose
B．center
C．overwork
D．concentrate
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