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）
亮點激活精編提優100分大試卷系列答案科目：高中英語 來源： 題型：
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語法填空「20巧.吉林省吉林市第一中學高一下學期第二次質檢]
閱讀下面材料，在空白處填人適當的內容（1個單詞）或括號內單詞的正確形式。
How life began on the earth
How the earth came into existence and how life began on the earth, no one knows 1.________ (exact) ， as it happened so long ago. However, according to a widely 2. ________ (accept) theory, the universe began with a "Big Bang" that threw matter 3. _________ all directions. After that, atoms began to form and combine to create stars and other bodies. Between 4. 5 and 3. 8 billion years ago, the earth became 4. ____ violent that it exploded loudly with fire and rock, producing water vapour and other gases.
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Millions of years later, life began to develop on the earth, from simple forms to advance ones, from oceans to land, from plants to animals. Finally about 2. 6 million years ago some clever animals appeared. 10.______ they have, in their turn, become the most important animals on the planet.
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10. They could have attended the awarding ceremony,
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12. Our responsibility is weightier than Mount Tai, and our road ahead is long one.
A. the; I B. a; the C. a; / D. /; a
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