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托福阅读修辞目的题：Lake Water

2015-08-13 16:15:43来源：网络

　　【托福阅读题型：Lake Water修辞目的题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之修辞目的题

　　托福阅读修辞目的题：Lake Water

　　【Paragraph 2】The questions become more complicated when actual volumes of water are considered: how much water　enters and leaves by each route? Discovering the inputs and outputs of rivers is a matter of measuring the discharges of　every inflowing and outflowing stream and river. Then exchanges with the atmosphere are calculated by finding the　difference between the gains from rain, as measured (rather roughly) by rain gauges, and the losses by evaporation,　measured with models that correct for the other sources of water loss. For the majority of lakes, certainly those surrounded by　forests, input from overland flow is too small to have a noticeable effect. Changes in lake level not explained by river flows　plus exchanges with the atmosphere must be due to the net difference between what seeps into the lake from the groundwater　and what leaks into the groundwater. Note the word "net" measuring the actual amounts of groundwater seepage into the　lake and out of the lake is a much more complicated matter than merely inferring their difference.(Lake Water)

　　Why does the author use the phrase Note the word "net" in the passage?

　　○To emphasize the impact of seepage on water levels

　　○To point out that seepage is calculated differently from river flows and atmospheric exchanges

　　○To compare the different methods of calculating seepage

　　○To emphasize the difficulty of obtaining specific values for seepage inputs and outputs

　　答案见下一页：

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