单项选择题

He made a summary of what had been done.

A．outline
B．motion
C．document
D．title
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单项选择题
The river widens considerably as it begins to turn east.
A．extends
B．stretches
C．broadens
D．traverses
单项选择题
The use of the chemical may present a certain hazard to the laboratory workers.
A．protection
B．indication
C．immunity
D．danger
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