It is well known that fats spoil by becomi
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It is well known that fats spoil by becoming rancid.
A:melt B:get used up C:go bad D:float
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答案：C
本句意思：众所周知，脂肪一旦变味就变质了。melt的意思为“融化”；短语get used up 的意思为“被用完”;go bad的意思为“变质，变坏”;float的意思为“漂浮”。spoil的意思为 "（使）变质；宠坏”，和go bad意思接近。