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Alow-carbon(低碳)lifestyle has an effect         our daily life.More and more attention has been paid to           Energies these days.
#46552
A
in;save
B
in;saving
C
on;save
D
on;saving
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Would you like some tea         honey?
#50009
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for
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of; for
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#50893
A
in
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on
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at