问题补充:
The story shows that knowledge of first aid can make real difference.
A. the; the; /
B. a; /; a
C. /; the; a
D. a; /; /
答案:
A. the; the; /
(答案→)B. a; /; a
C. /; the; a
D. a; /; /
解析:
这题考查冠词的用法:第一空填a,a knowledge of是“知道,了解”,第二空不填,是泛指“急救”,第三空填a,make a real difference.是固定词组“真的有影响”。