It shows that a knowledge of first aid c...

It shows that a knowledge of first aid can make a real .

A．effect

B．effort

C．importance　　　

D．difference

D 【解析】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。考点：考查固定结构

考点分析：

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