单项选择题
In the process of （）, liquid changes into gas.
A.evaporation
B.frosting
C.condensing
D.compressing
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A.consume
B.distill
C.run
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Clean oil is achieved in a clarifier bowl where the impurities and water collect at the bowl （）.
A.bottom
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The fresh water generator produces fresh water （）.
A.by cooling sea water
B.by heating sea water
C.by evaporation of sea water
D.by purifying sea water
