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It shows that a knowledge of first aid can make a real       .
A.effectB.effortC.importance   D.difference
D

试题分析:考查固定结构。Make a difference起作用,有影响。句意:结果显示急救知识真的有很大作用。根据句意说明D正确。
点评:difference的用法中Make a difference起作用,有影响;是一个很重要的考查点。另外还有注意:tell the difference between…and…
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