Tpo24阅读分析(2)

○Overland flow into lakes is reduced by the presence of forests.

○Seepage has a smaller effect on water level than any other input.

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此题关键词难找，所以可以用排除法，当然也可以根据有序性往下找。这里我们用排除法。A的heavy rain和most of thewater原文完全没有相关信息，错；B的evaporation和rainfall做关键词定位至第三句，但文章明确说了可以通过蒸发跟雨水获得的差值计算湖水与大气的交换，也就是说二者是有差异的，B说反；C的forests做关键词定位至第四句，说周围有森林的湖陆上来水很难有明显影响，推出C说水量减少是正确选项，因果关系；D的seepage做关键词定位至最后，但原文没有任何比较的相关信息，错

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paragraph4: By whatever means, a lake is constantly gaining water and losing water: its water does not just sit there, or, anyway, not for long. This raises the matter of a lake’s residence time. The residence time is the average length of time that any particular molecule of water remains in the lake, and it is calculated by dividing the volume

would depend on the route it took: it might flow through as part of the fastest, most direct current, or it might circle in a backwater for an indefinitely long time.

7. It can be inferred from paragraph 4 that the length of time a given molecule of water remains in a lake

○depends entirely upon the average speed of a lake' s currents

○can be measured by the volume of the lake alone

○can be greater or lesser than the residence time