单项选择题

Techniques to harness the energy of the sun are being developed.

A. convert
B. store
C. utilize
D. receive
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单项选择题
Even in a highly modernized country, manual work is still needed.
A. expressive
B. physical
C. exaggerated
D. dubious
单项选择题
You must shine your shoes.
A. lighten
B. clean
C. wash
D. polish
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