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
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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．travels
单项选择题
The leading astronomers of the sixteenth and seventeenth centries were fascinated by comets.
A．intrigued
B．infected
C．inconvenienced
D．inclined
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