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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单项选择题
The Chinese government reiterates that Taiwan is China's ______ and the question of Taiwan is China's internal affair.
A．domain
B．realm
C．district
D．territory
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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