单项选择题

In their productions, choreographers of modern dance have introduced humor, protested social injustice, and probed psychological problems.

A．solved
B．explored
C．involved
D．disputed
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单项选择题
The towers of a suspension bridge serve as a rigid framework to which the cables are attached.
A．boundary
B．skeleton
C．enclosure
D．material
单项选择题
The river widens considerably as it begins to turn east.
A．extends
B．stretches
C．broadens
D．travels
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