2. 外语
  3. Nature has s prefect system for recycling water. Water is used again and again. It falls as rain.【B1】it goes one of three places

Nature has s prefect system for recycling water. Water is used again and again. It falls as rain.【B1】it goes one of three places

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问题     Nature has s prefect system for recycling water. Water is used again and again. It falls as rain.【B1】it goes one of three places. It might seep slowly through the soil【B2】it soaks through into the natural reservoirs【B3】. It might disappear into the air by【B4】quickly. It might【B5】into streams to rivers and to the oceans.
    There is a problem【B6】this recycling system. It is a balance that can be easily【B7】by people. Nature’s recycling system can work well【B8】people work with the system-not【B9】it. Some ways that people【B10】with nature are easy【B11】. Dirty sewage water from homes and factories must not【B12】with drinking water. People would get sick from drinking dirty water.
【B13】other ways that people hinder nature. Some of these ways are not so easy to understand.【B14】, a marshy bog(沼泽) may not be good for everything, but it【B15】an important purpose. The soft and wet soil of a bog【B16】water to reach the underground reservoirs. What happens to the balance of nature if the bog is filled in? Many housing development projects have been built【B17】marshes once were. The【B18】of the houses are likely to have problems. They are likely to【B19】water, to flood in【B20】seasons. Huge storm sewers are built to carry away with the water from wet areas. These huge pipes prevent wet basements in the houses of the community.
选项 A、Therefore
B、Then
C、Consequently
D、Nevertheless
答案B
解析 语法题。此题考查句子的衔接，由上下文可知，此处的空白项需要一个表示顺序的连接副词，而therefore，consequently和nevertheless则分别是“因此”、“结果是”和“然而”，表示因果、结果和转折，所以，then是正确的。
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