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1970年,阿斯旺大坝修建完工后,为尼罗河沿岸带来不少益处,但也带来不少环境问题。该图为尼罗河流域与西亚关系图。读图,回答6—8题。小题1:关于尼罗河的叙述,正确的是:
A.上游接近赤道,位于干旱炎热区
B.集水区水资源分配成为国际问题
C.红海阻隔自古即与西亚不相往来
D.大坝湖区地处埃及和埃塞俄比亚交界小题2:下列不是阿斯旺大坝带来的环境与社会经济影响:
A.输沙量减少、河口三角洲面积萎缩
B.全年灌溉导致土壤盐碱化面积增加
C.水力发电量大、能供应沙特阿拉伯
D.蓄水湖区成为埃及渔业的生产基地小题3:许多研究指出,地中海东南沿岸渔业资源减少与阿斯旺大坝的兴建有关。其最可能的原因是:
A.大坝拦截了大量泥沙,造成河口鱼类缺少营养物质
B.大坝的水力发电量大,导致地中海浮游生物等触电
C.尼罗河两岸农民使用人工肥料,促使入海水质恶化
D.尼罗河两岸农民施行人工灌溉,致使海水盐度下降
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
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
A坡面流
B沟道水流
C地表水
D地下水
E河岸
流域不具有( )。
A、地面集水区域
B、地下集水区域
C、地面分水线
D、大片地下岩溶区