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It makes _______ big difference to keep calm when giving _______ first aid.
A.a, /B./, theC.a, theD./,a
A

试题分析:考查冠词。第一个空是固定短语make a big difference “起重要作用”。第二个空也是固定短语first aid“急救”不用冠词。句意:当实施急救时保持镇静很重要。所以答案选A。
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