【托福阅读题型：Groundwater句子简化题】托福阅读中句子简化题是重要题型之一。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!

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　　托福阅读句子简化题：Groundwater

　　【Paragraph 9】The relative amount of these two kinds of water varies greatly from one kind of rock or sediment to　another, even though their porosities may be the same. What happens depends on pore size. If the pores are large, the　water in them will exist as drops too heavy for surface tension to hold, and it will drain away; but if the pores are small　enough, the water in them will exist as thin films, too light to overcome the force of surface tension holding them in place;　then the water will be firmly held.(Groundwater)

　　Which of the sentences below best expresses the essential information in the highlighted sentence in thepassage? Incorrect choices change the meaning in important ways or leave out essential information.

　　○Surface tension is not strong enough to retain drops of water in rocks with large pores but it strong enough to　hold on to thin films of water in rocks with small pores.

　　○Water in rocks is held in place by large pores and drains away from small size pores through surface tension.

　　○Small pores and large pores both interact with surface tension to determine whether a rock will hold water asheavy drops or as a thin film.

　　○If the force of surface tension is too weak to hold water in place as heavy drops, the water will continue to be held firmly in place as a thin film when large pores exist.