单项选择题

Hens laying eggs need plenty of nourishing food.

A. eat
B. require
C. find
D. use
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单项选择题
The recycling of aluminum conserves ninety-five percent of the energy needed to make new metal.
A. cleaning
B. reprocessing
C. reselling
D. crushing
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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