阅读材料，回答问题。    某水库是福建省的重要饮用水源地，其沿岸土地利用类型的变化，对河流水质产生了明显的影响。下图示意该水库集水区域土地利用类型和水质的变化趋势（水质污染综合指数高表示污染严重）。

（1）指出2008~2010年该水库水质变化的总体趋势，并分析原因。

_______________________________（2）简述改善库区水质的主要措施。_______________________________

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• b河长度比a河短，但水量远大于a河，下列有关其原因的解释错误的是（）

  A．b河流淌在非洲最大的盆地中，集水区域广，流域面积大

  B．b河流经热带雨林气候区，降水丰富

  C．b河支流比a河多

  D．b河水量季节变化大，a河水量季节变化小

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• Questions 26 to 30 are based on the following passage.The word conservation has a thrifty (节俭) meaning. To conserve is to save and protect, to leave what we ourselves enjoy in such good condition that others may also share the enjoyment. Our forefathers had no idea that human population would increase faster than the supplies of raw materials; most of them, even until very recently, had the foolish idea that the treasures were “limitless” and “inexhaustible”. Most of the citizens of earlier generations knew little or nothing about the complicated and delicate system that runs all through nature, and which means that, as in a living body, an unhealthy condition of one part will sooner or later be harmful to all the others.

  Fifty years ago nature study was not part of the school work; scientific forestry was a new idea; timber was still cheap because it could be brought in any quantity from distant woodlands; soil destruction and river floods were not national problems; nobody had yet studied long-terms climatic cycles in relation to proper land use; even the word “conservation” had nothing of the meaning that it has for us today.

  For the sake of ourselves and those who will come after us, we must now set about repairing the mistakes of our forefathers. Conservation should, therefore, be made a part of everyone’s daily life. To know about the water table (水位) in the ground is just as important to us as a knowledge of the basic arithmetic formulas. We need to know why all watersheds (上游源头森林地带集水区) need the protection of plant life and why the running current of streams and rivers must be made to yield their full benefit to the soil before they finally escape to the sea. We need to be taught the duty of planting trees as well as of cutting them. We need to know the importance of big, mature trees, because living space for most of man’s fellow creatures on this planet is figured not only in square measure of surface but also in cubic volume above the earth. In brief, it should be our goal to restore as much of the original beauty of nature as we can.

  第26题：The author’s attitude towards the current situation in the exploitation of natural resources is ________.

  A) positive

  B) neutral

  C) suspicious

  D) critical

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• 流域是指由（）所包围的河流或湖泊的地面集水区和地下集水区的总和。

  A、分水岭

  B、气候带

  C、分水线

  D、地理分界

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