题目：
| 完型填空。 | ||||
| Mary has some friends. 1 Betty, Peter, Alice 2 Mike. Mary is the oldest 3 . Betty is thirteen years 4 . She is younger than Mary and older than Peter. Alice is nine and Mike is seven. Betty and Peter are 5 runrung. But Peter runs faster. Mary and Betty like to _6 . Mary plays better than Bettey. Alice sings 7 0f them. Mary and Betty study in a middle school. Alice and Mike study in a primary school. They 8 work hard at school. But Betty works 9 . Her handwriting is good, 10 . | ||||
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答案：
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原因：最直接的原因是降水强度太大；现有的排涝设施落后于城市建设步伐；城市不透水层面积扩大；管理不善，城市垃圾堵塞排涝渠道等。措施：加强城市排涝系统的建设、管理和维护；增加城市绿地面积；加强暴雨的预...
