Official 01 Passage 1

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Groundwater

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Directions: An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express the most important ideas in the passage. Some sentences do not belong in the summary because they express ideas that are not presented in the passage or are minor ideas in the passage. This question is worth 2 points.

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Much of the ground is actually saturated with water.

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正确答案:A B C
  • A.
    Sediments that hold water were spread by glaciers and are still spread by rivers and streams.
  • B.
    Water is stored underground in beds of loose sand and gravel or in cemented sediment.
  • C.
    The size of a saturated rock’s pores determines how much water it will retain when the rock is put in a dry place.
  • D.
    Groundwater often remains underground for a long time before it emerges again.
  • E.
    Like sandstone, basalt is a crystalline rock that is very porous.
  • F.
    Beds of unconsolidated sediments are typically located at inland sites that were once underwater.

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  • 原文
  • 译文
  • Groundwater is the word used to describe water that saturates the ground, filling all the available spaces. By far the most abundant type of groundwater is meteoric water; this is the groundwater that circulates as part of the water cycle. Ordinary meteoric water is water that has soaked into the ground from the surface, from precipitation (rain and snow) and from lakes and streams. There it remains, sometimes for long periods, before emerging at the surface again. At first thought it seems incredible that there can be enough space in the "solid" ground underfoot to hold all this water.



    The necessary space is there, however, in many forms. The commonest spaces are those among the particles-sand grains and tiny pebbles-of loose, unconsolidated sand and gravel. Beds of this material, out of sight beneath the soil, are common. They are found wherever fast rivers carrying loads of coarse sediment once flowed. For example, as the great ice sheets that covered North America during the last ice age steadily melted away, huge volumes of water flowed from them. The water was always laden with pebbles, gravel, and sand, known as glacial outwash, that was deposited as the flow slowed down.



    The same thing happens to this day, though on a smaller scale, wherever a sediment-laden river or stream emerges from a mountain valley onto relatively flat land, dropping its load as the current slows: the water usually spreads out fanwise, depositing the sediment in the form of a smooth, fan-shaped slope. Sediments are also dropped where a river slows on entering a lake or the sea, the deposited sediments are on a lake floor or the seafloor at first, but will be located inland at some future date, when the sea level falls or the land rises; such beds are sometimes thousands of meters thick.



    In lowland country almost any spot on the ground may overlie what was once the bed of a river that has since become buried by soil; if they are now below the water's upper surface (the water table), the gravels and sands of the former riverbed, and its sandbars, will be saturated with groundwater.



    So much for unconsolidated sediments. Consolidated (or cemented) sediments, too, contain millions of minute water-holding pores. This is because the gaps among the original grains are often not totally plugged with cementing chemicals; also, parts of the original grains may become dissolved by percolating groundwater, either while consolidation is taking place or at any time afterwards. The result is that sandstone, for example, can be as porous as the loose sand from which it was formed.



    Thus a proportion of the total volume of any sediment, loose or cemented, consists of empty space. Most crystalline rocks are much more solid; a common exception is basalt, a form of solidified volcanic lava, which is sometimes full of tiny bubbles that make it very porous.



    The proportion of empty space in a rock is known as its porosity. But note that porosity is not the same as permeability, which measures the ease with which water can flow through a material; this depends on the sizes of the individual cavities and the crevices linking them.



    Much of the water in a sample of water-saturated sediment or rock will drain from it if the sample is put in a suitable dry place. But some will remain, clinging to all solid surfaces. It is held there by the force of surface tension without which water would drain instantly from any wet surface, leaving it totally dry. The total volume of water in the saturated sample must therefore be thought of as consisting of water that can, and water that cannot, drain away.



    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.


  • 地下水是指渗入到地下并将所有岩石孔隙填满的水。到现在为止,大气水是最丰富的地下水资源,是地下水在水循环中的一个环节。普通的大气水会从地表、降水以及湖泊河流侵入到地下。在再次冒出地表之前,这些地下水有时会长时间留在地下。最初让人觉得难以置信的是,在我们脚下“坚实的”土地中竟然有足够的空间能储存这么些水。

    然而,地下水所需的储存空间多种多样。松散的砂子和砾石间有许多颗粒,如沙粒和小石子,它们之间的孔隙是最常见的储存地下水的空间。由这些颗粒组成的水床非常普遍,通常位于看不见的土壤下方,在携带粗糙沉淀物的湍急的河流曾流过的地方都能找到它们的踪迹。比如,冰河时代覆盖北美的巨大冰层逐渐融化,大量水从那儿流出。水里总会携带些石子、砾石和沙石,这些颗粒会随着水流的减速而沉淀,这就是所谓冰河期的冰水沉积。

    现代也有冰水沉积,尽管规模相对较小。凡是有携带沙石的河流或者溪流从山谷流至相对平坦的地面时,砂石就随着水流速度的减慢逐渐沉淀;水流通常呈扇形扩散,它们所携带的沙石也会沉淀为光滑的扇形斜面。当河流汇入湖泊和海洋的时候也会有沉淀,这些沉淀最初在湖底或海底,但将来海平面下降或者陆地崛起时,它们就会分布于内陆,通常厚达几千米。

    低地区域上的任何位置可能就是曾经的河床,后续被土壤覆盖而变成现在的样子。如果那些过去的河床和沙洲现在位于地下水位之下,一定会有大量的地下水浸在它们的沙子和砾石之间。

    以上说的都是松散的沉积物,那些坚固的沉积物,也拥有以数万计的毛细孔来容纳水。因为最初颗粒间的缝隙通常并未完全被黏固的化学物质塞满,而且部分颗粒很可能在固化时或固化后被渗入的地下水溶解;结果这些砂岩最终变得和形成它的散沙一样多孔。

    因此,不管沉积物是疏松还是坚固,它们中一定有空间。大部分结晶体岩石都非常坚硬,但也有例外,最常见的就是玄武岩,它是一种固化的火山熔岩,经常充满了微小气泡,从而变得十分多孔。

    岩石的孔隙度就是指其中空间的比例。但需要注意的是,孔隙度与渗透率是不同的。渗透率衡量的是水渗透物质的难易程度,它取决于与单个空隙以及连接孔隙间裂缝的大小。

    当充满水分的沉淀物或者岩石样本被放置在适宜的干燥环境中时,大部分的水分会流失,但仍有部分水会继续附着在坚实的表面上。要不是因为表面张力,这些水分也会立刻蒸发,仅留下完全干燥的样本。因此,试验样本的含水量既包括可以流干的水,也包括不能流干的水。

    这两种水的相对含量因岩石或沉积物种类不同而改变,即便它们有相同比例的孔隙,还取决于孔隙的大小。如果孔隙很大,其中的水会形成水滴,太重足以克服吸引它的表面张力,就会流走;但如果孔隙够小,水会像薄膜一样,太轻无法克服表面张力,从而稳稳地附着在孔隙表面上。
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    解析


    题型分类:总结题

    文章结构分析:


    这是一个说明型文章,主要讲的是地下水的存在。

    第一段介绍了地下水的定义、来源以及与水循环的关系;

    第二段介绍地下水出现最平常的地方是松散沙石微粒之间空间,而这些松散沙石物质通常存在于携带沉积物的湍流河水曾今流过的地方,为此举了一个冰河时期的例子,冰川融化形成的水流携带沉积物的例子。

    第三段讲了现在的河流湖泊也会携带这样的沉淀物,从山谷流向平地,速度变慢,于是把沉积物沉淀到那儿,形成光滑扇形坡;沉积物在河水入湖口和入海口也会被沉淀,只要水流速度慢下来就行,经常是沉淀在湖底或海床上。

    第四段讲低地几乎每个地方都覆盖了曾今被泥土覆盖的河床,那里的沙石沙砾也会充满地下水。

    第五段开始讲非松散沉积物中储存水,原因是之前微粒的空间并没有完全被粘合化学物质占去,所以部分微粒可能在固化过程中或者之后被穿透的地下水溶化。导致的结果就是砂岩可能和形成它的松散沙子一样多孔。

    第六段说任何沉积物,不管松散还是坚固,都有一部分包含空隙。大多数晶体岩很坚固,但有特例,玄武岩就是一个充满气泡的多孔晶体岩石。

    第七段介绍了孔隙度,还讲了孔隙度与渗透性的差别。

    第八段讲在干燥环境下,沉积物中有些水会留着,有些水会流干,总水量应该是包括两种水。

    第九段讲是空隙的大小尺寸决定了水是否会流干。

    选项分析:

    Much of the ground is actually saturated with water. (很大部分地是充满水的)。

    a)储存水的沉淀物曾今被冰川扩散并且现在还被河流溪水扩散。

    b)储存在地下的水都处在沙子和沙砾基底或者在坚固的沉淀物中。

    c)当被放置在干燥的地方时,饱和岩石空隙的大小决定了有多少水会被保留。

    d)重新出现之前,地下水会在地下保持很久。

    e)与砂岩一样,玄武岩是一种特别多孔的晶体岩石。

    f)松散沉积物的基地通常位于那些曾今在水下的内陆地点。

    解析:选项一对,第二段“For example, asthe great ice sheetsthat covered …..”提到被冰川扩散;第三段“The same thing happens to this day, …..wherever asediment-laden river or streamemerges from a mountain valley onto relatively flat land,….”

    选项二对,第二段讲到必要的空间在沙子和沙砾的微粒间的空隙中;第五段第二句“Consolidated(cemented) sediments, too , contain millions of minute water-holding pores.”

    选项三对,最后一段讲到“What happensdepends on pore size.”最后一段也是为了解决倒数第二段提出的问题:什么决定哪部分水留下来,哪部分水流干?

    选项四错,这是第一段的一个细节。

    选项五错,原文没讲到basalt和sandstone一样。

    选项六错,原文没有提到松散沉积物的基地typically都在曾今是水下的陆地。

    因此,答案是:1,2,3;

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