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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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
单项选择题
It was hard to say why the man deserved such shabby treatment.
A．unforgettable
B．unbelievable
C．unfair
D．unthinkable
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