One way of producing cold is to allow ______ . [br] To keep food in a good condi

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问题 One way of producing cold is to allow ______ . [br] To keep food in a good condition, refrigeration is ______ .

选项 A、the only useful way
B、one of the two ways mentioned
C、only one of many ways used
D、one of the useful ways

答案 D

解析本题题干问“冷藏与保存食物的关系”。原文第1段第1句话指出冷藏是保存食物的重要方法之一。因此选项D. one of the useful ways是正确答案。

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Onewayofproducingcoldistoallow______.[br]Thetemperatureofagas___