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

13.   D   考查冠詞的用法。keep... in mind牢記 在心，mind前不加冠詞。emergency "緊急情況，突然事件"，是可數(shù)名詞。如：In an emergency, phone 999 for help.遇上緊急事件立刻撥999求救。an emergency —件突發(fā)事件。故選D。

題目來源：2015全品語法快練高中英語新課標 > 綜合訓練（四）

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