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阅读理解，阅读下面短文，从每题所给的A、B、C、D四个选项中，选出最佳选项。
During recent years, floods and flash floods have caused billions of dollars in damage．They are among the most common and widespread of all natural disasters．Even more importantly, they’re the No．1 weather-related killer．A food can happen anywhere along the Mississippi, in New England, even in the desert．
The following are some fascinating facts about floods and flash floods．
A flood(commonly called a river flood)is the high flow of water from a river of similar body of water, happening over a period of time too long to be considered a flash flood．Flooding is caused in many ways．Winter or spring rains, together with melting snows, can fill rivers too quickly．Heavy rains from hurricanes or other tropical systems can also produce river flooding．The Mississippi River Flood of 1993 was caused by repeated heavy rain from thunderstorms over a period of weeks．
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 bridge 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．
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