It shows that a knowledge of first aid can .A. make a differenceB. fall illC. squeeze outD

问题补充：

It shows that a knowledge of first aid can .

A. make a difference

B. fall ill

C. squeeze out

D. put its hands on

答案：

(答案→)A. make a difference

B. fall ill

C. squeeze out

D. put its hands on

解析：考查短语辨析。make a difference 有意义，有所不同，fall ill 生病，squeeze out挤出，put its hands on着手工作，句意：表明急救知识会有意义。所以选A。