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
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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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