单项选择题

Color changes in chameleons seem to be caused by environmental temperature as well as by other external stimuli.

A．ought
B．have
C．appear
D．used
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单项选择题
Hens laying eggs need plenty of nourishing food.
A．eat
B．require
C．find
D．use
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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