单项选择题

Many city dwellers are turning vacant lots into thriving gardens.

A. costly
B. empty
C. small
D. shady
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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
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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