单项选择题

In most places, the edges of the continents slope gradually before making a sharp drop to the ocean floor.

A．random
B．sudden
C．dangerous
D．brief
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单项选择题
The most widely seen sculptural work done by Augusta Savage was probably Lift Every Voice and Sing , shown at the 1939-1940 New York world's fair.
A．viewed
B．painted
C．circulated
D．discussed
单项选择题
Scott seized the opportunity to present his proposal to the director.
A．realized
B．grasped
C．rendered
D．delivered
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