Question

13. The most important thing to keep in   mind when dealing with    emergency is

to stay calm.

A. /; the      B.   the; an

C. the; the    D.  /； an

Answer 1

13.   D   考查冠词的用法。keep... in mind牢记 在心，mind前不加冠词。emergency "紧急情况，突然事件"，是可数名词。如：In an emergency, phone 999 for help.遇上紧急事件立刻拨999求救。an emergency —件突发事件。故选D。