一、单项选择（15小题，每小题1分，共15分）
从A、B、C、D四个选项中选出可以填入空白处的最佳选项。
1. We should try our best to ______ the sandstorms and protect our homeland.
A. give up B. fight against C. take away D. look after
2. It’s dangerous to walk in the floodwater. You must keep ______.
A. safe B. calm C. quiet D. free
3. Trees can help ______ soil and stop floods from happening.
A. waste B. prevent C. reach D. cover
4. ______ it rains heavily tomorrow, we won’t go hiking in the mountains.
A. If B. Though C. Because D. So
5. The typhoon is coming. We ______ stay indoors and keep away from windows.
A. may B. can C. must D. might
6. People threw rubbish into the river, ______ the water became dirty.
A. but B. so C. or D. for
7. This is a ______ rainstorm. It’s much stronger than any other one this year.
A. sudden B. basic C. strange D. terrible
8. We can ______ a big difference by saving water and planting more trees.
A. take B. do C. make D. get
9. When you are in danger, you ______ be nervous. Keep cool first.
A. mustn’t B. needn’t C. won’t D. wouldn’t
10. The flood washed ______ many houses last month.
A. out B. away C. off D. up
11. ______, protecting nature is protecting ourselves.
A. In fact B. In short C. At first D. At last
12. The wind is blowing ______ than yesterday. We’d better not go out.
A. strong B. stronger C. strongest D. the strongest
13. Many soldiers came to help ______ the people in the disaster area.
A. for B. with C. against D. /
14. —______ will the typhoon arrive?
—In two hours.
A. How long B. How far C. How soon D. How often
15. We should learn ______ to keep safe when a natural disaster happens.
A. what B. how C. where D. when
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