题干

【自然灾害与防治】

按照降水量的大小,降水分为小雨(0.1~9.9mm/天)、中雨(10~24.9mm/天)、大雨(25~49.9mm/天)、暴雨(50~99.9mm/天)、大暴雨(100~200mm/天)、特大暴雨(大于200mm/天)、6个等级。下图为广州市2013年8月15日的实测降水—径流过程图。这次降水天气过程使广州市部分城区形成了严重的内涝。分析2013年8月15日广州部分城区内涝的原因。

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答案(点此获取答案解析)

暴雨天气,降水历时长,降水量大;城市硬化地面多,雨水下渗减少;地面径流汇集快,流量大;城市地下管网排水能力不足,无法应对极端降水,大量雨水滞留城区;广州位于沿海,潮汐对地下水有顶托作用,水不易排出。

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    What would you do if you had $5, but were limited to two hours to make as much money as possible? Buy a lottery ticket. While this is the most 1suggestion from people, it means a significant risk in return for a 2chance.

    Tina Selling, who invented the3for her students of Stanford University, has a 4story to tell.

    Selling gave each of the fourteen teams a sealed envelope that contains five dollars of “seed funding”. They were5to spend as much time planning, but once they had6the envelop they then had two hours to make as much money as possible. The next week, each team were to7their project in a three-minute presentation.

    It8that most of the 14 teams didn't use the five dollars9 They realized that focusing on the10actually limited the problem way too tightly. They understood that five dollars is essentially11and decided to reinterpret the problem more12what can be done if 13with absolutely nothing?

    The average14on the five dollar investment was 4,000 percent! So what did they 15do?

    One team started a stand on campus to check bike tire16for free and charged $1to refill tires. Another team made17at busy restaurants and then sold each of them for up to twenty dollars to customers who didn't want to18inline. The team who made the greatest 19sold their presentation time to a company that wanted to employ them to advertise. They 20a good business for that company in the three minutes' presentation and brought in $ 650,000.