One way of producing cold is to allow ______ . [br] It is possible to keep food

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问题 One way of producing cold is to allow ______ . [br] It is possible to keep food cool with a liquid if ______ .

选项 A、it has slow-moving molecules
B、it passed through a hole
C、it is turned into steam
D、it becomes liquid oxygen

答案 C

解析本题题干问“如何用液体来让食物变冷”。原文第2段第2句话指出蒸发可以降低液体温度，从而来冷藏食物。因此选项C. it is turned into steam是正确答案。

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