Flash floods are quickly-rising floods which are usually the result of heavy rains over a short period of time, often only several hours or even less. They can also be caused by ice jams(冰塞)on rivers related to a winter or spring melting, or occasionally even a dam break. The constant influx(汇集)of water finally causes a great overflow to begin, powerful enough to sweep vehicles away, roll big stones into roadways, uproot trees, level buildings, and knock bridges down. The speed of the rising of water is the most frightening thing.
Remember: Move to higher ground and stay away from low areas during heavy rain. Stay out of flooded areas. Never allow children to play or walk in flowing water. Never drive your car into water of unknown depths.
48. What is the best title for the passage?
A. Power of floods B. Damage of floods C. When floods happen D. Facts about floods
49. The last paragraph is mainly about ________.
A. flood safety tips B. warnings for floods C. waste water systems D. flood prevention
50. Which of the following statements is NOT the reason for the occurrence of flash floods?
A. Heavy rains. B. Ice jams. C. Dam breaks. D. Ground water rising.
51. According to the passage, people are most afraid of _______ during flash floods.
A. the constant influx of water B. the sudden occurrence of flash floods
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2020-09-15
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