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托福阅读词汇题：fractures

2015-08-26 15:28:38来源：网络

　　【托福阅读题型：fractures词汇题】托福阅读中词汇题是重要题型之一。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词汇题

　　托福阅读词汇题：fractures

　　【Paragraph 6】Groundwater is stored in the pore spaces and joints of rocks and unconsolidated (unsolidifie○　sediments or in the openings widened through fractures and weathering. The water-saturated rock or sediment is　　known as an "aquifer". Because they are porous, sedimentary rocks, such as sandstones and conglomerates, are　　important potential sources of groundwater. Large quantities of water may also be stored in limestones when joints　and cracks have been enlarged to form cavities. Most limestone and sandstone aquifers are deep and extensive but　may contain groundwaters that are not being recharged. Most shallow aquifers in sand and gravel deposits produce　lower yields, but they can be rapidly recharged. Some deep aquifers are known as "fossil waters. The term "fossil"　describes water that has been present for several thousand years. These aquifers became saturated more than10,000 years ago and are no longer being recharged.(Water in the Desert)

　　The word “fractures” in the passage is closest in meaning to

　　○streams

　　○cracks

　　○storms

　　○earthquakes

　　答案见下一页：

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