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

问题补充：

It makes big difference to keep calm when giving first aid.

A. a, /

B. /, the

C. a, the

D. /,a

答案：

(答案→)A. a, /

B. /, the

C. a, the

D. /,a

解析：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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