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托福阅读句子插入题：Water in the Desert

2015-08-20 17:32:19来源：网络

　　【托福阅读题型：Water in the　　Desert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：Water in the　　Desert

　　【Paragraph 4】Regularly flowing rivers and streams that originate within arid lands are known as "endogenous."　These are generally fed by groundwater springs, and many issue from limestone massifs, such as the Atlas Mountains　in Morocco. Basaltic rocks also support springs, notably at the Jabal Al-Arab on the Jordan-Syria border.

　　■Endogenous rivers often do not reach the sea but drain into inland basins, where the water evaporates or is lost in　the ground. ■Most desert streambeds are normally dry, but they occasionally receive large flows of water and　sediment. ■

　　【Paragraph 5】Deserts contain large amounts of groundwater when compared to the amounts they hold in　surface stores such as lakes and rivers. ■But only a small fraction of groundwater enters the hydrological cycle—　feeding the flows of streams, maintaining lake levels, and being recharged (or refille○ through surface flows and　　rainwater. In recent years, groundwater has become an increasingly important source of freshwater for desert　dwellers. The United Nations Environment Programme and the World Bank have funded attempts to survey the　groundwater resources of arid lands and to develop appropriate extraction techniques. Such programs are much　needed because in many arid lands there is only a vague idea of the extent of groundwater resources. It is known,however, that the distribution of groundwater is uneven, and that much of it lies at great depths.(Water in the　　Desert)

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

　　These sudden floods provide important water supplies but can also be highly destructive.

　　Where would the sentence best fit?

　　答案见下一页：

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