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
Respect for each other's sovereignty and non-interference in each other's internal affairs ______ the fundamental principles guiding Sino-American relations.
A．confirm
B．construct
C．compose
D．constitute
单项选择题
Ahead of other parts of the nation, the territory of Wyoming granted women the vote in 1869.
A．Preceding
B．Preventing
C．Opposing
D．Urging
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