单项选择题

This is a subject that has now moved into the political domain.

A．extent
B．zone
C．area
D．competition
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单项选择题
He made a summary of what had been done.
A．outline
B．motion
C．document
D．title
单项选择题
The river widens considerably as it begins to turn east.
A．extends
B．stretches
C．broadens
D．traverses
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