[单选题]CFC coolants must be removed from fridges because __________.
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2023-10-01 08:00:30
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[单选题]CFC coolants must be removed from fridges because __________.

A.it is a kind of precious metal like gold and platinum
B.it would deplete the ozone layer if not removed
C.it can be used again when put into new fridges
D.some people collect it as a hobby
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