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托福阅读句子插入题:Groundwater

2015-08-24 16:41:38来源:网络

  【托福阅读题型:Groundwater句子插入题】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句子插入题

  托福阅读句子插入题:Groundwater

  【Paragraph 4】The water table is the underground boundary below which all the cracks and pores are filled with water. In some cases, the water table reaches Earth’s surface, where it is expressed as rivers, lakes and marshes.  ■Typically, though, the water table may be tens or hundreds of meters below the surface. ■The water table is not flat but usually follows the contours of the topography. ■Above the water table is the vadose zone, through which rainwater percolates. ■Water in the vadose zone drains down to the water table, leaving behind a thin coating of water on mineral grains. The vadose zone supplies plant roots near the surface with water.(Groundwater)

  Look at the four squares [■] that indicate where the following sentence could be added to the passage.

  This is a consequence of the slow rate of movement of the groundwater, which often prevents the water table from

  attaining a flat (horizontal) level.

  Where would the sentence best fit?

  答案见下一页:

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