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【阅读----黄金29篇第10篇】
又错了3题,其中还有一题是最后一题:
Paragraph 2: 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.
4. According to paragraph 2, where is groundwater usually found?
○Inside pieces of sand and gravel
○On top of beds of rock
○In fast rivers that are flowing beneath the soil
○In spaces between pieces of sediment
这一题错的理由值得注意,GRE阅读思维---最高级思维作怪,下意识题目理解为最能找到的地方。还有就是选项理解也存在问题。选项1是指内部沙粒。
那其实从句子之间的逻辑关系,我们可以看出这一段的重要句子是蓝色部分。从中可以推断出选项4是正确的。
Paragraph 8: 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.█
13. Look at the four squares [ █ ] that indicate where the following sentence could be
added to the passage.
What, then, determines what proportion of the water stays and what
proportion drains away?
Where would the sentence best fit? Click on a square to add the sentence to the passage.
在这里我们顺便来看看这个drain到底是什么意思,我根深蒂固的意思是排水:
drain:
1 obsolete : FILTER
2 a : to draw off (liquid) gradually or completely *drained all the water out* b : to cause the gradual disappearance of *drain the region's wealth* c : to exhaust physically or emotionally *feeling drained at the end of a long workday*
3 a : to make gradually dry *drain a swamp* b : to carry away the surface water of *the river that drains the valley* c : to deplete or empty by or as if by drawing off by degrees or in increments *drained the country of its resources* d : to empty by drinking the contents of *drain a mug of beer*
4 : DROP 7c, SINK *drained the putt*
intransitive verb
1 a : to flow off gradually b : to disappear gradually : DWINDLE
2 : to become emptied or freed of liquid by its flowing or dropping *waiting for the tub to drain*
3 : to discharge surface or surplus water
那看起来他的总的意思是消失,变空,或者是使消失
所以这一题只要我们认真分析,就不难选出是4,这一题错的原因是感觉时间上没把握好,这里有点赶。没好好分析。
14. 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.
Much of the ground is actually saturated with water.
●●● Answer choices
○Sediments that hold water were spread by glaciers and are still spread by rivers and
streams.
○Water is stored underground in beds of loose sand and gravel or in cemented sediment.
○The size of a saturated rock’s pores determines how much water it will retain when the
rock is put in a dry place.
○Groundwater often remains underground for a long time before it emerges again.
○Like sandstone, basalt is a crystalline rock that is very porous.
○Beds of unconsolidated sediments are typically located at inland sites that were once
underwater.
那这最后一题我们要回顾原文总体了:
GROUNDWATER
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.
这第一段作者提出了核心概念稍作解释后提出了要讨论的问题,那就是咋看坚硬的地表要hold那么多水好像不可能。那接下来就要解释这个。
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.
这一段就解释hold的空间在哪里,说有很多种形式。其中They are found wherever fast
rivers carrying loads of coarse sediment once flowed. 很常见
The same thing happens to this day, though on a smaller scale, wherever a sedimentladen
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.
这里讲了一种特别的和上面原理一致的胆识小范围的情形,那就是扇形的坡面,河床,海床等。
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 river bed, and its sandbars, will be saturated
with groundwater.
又举了一个例子,那就是低洼国家几乎每个地方之前都是河床之类的。
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.
从这一段可以看出之前讲的都是unconsolidated sediments,本段就提出了cemented sediments也能。还解释了理由。提出了porous的概念。
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.
这里讲了有一个很porous的例子。
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.
What, then, determines what proportion of the water stays and what
proportion drains away?
这里正是提出了porosity的概念并且和permeability做区分。然后讲了drain away和stay这两种水的去向问题。
提出问题说什么来决定这个比例。
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.
这里解决了上面提出的问题,那就是这水的去留的比例由什么决定,问题的答案是和porosity没有关系,和这个pore的size有关。
题目解答:
那首先我们能选出2和3是对的,其实这两个就基本说明了本文的两个重点,一个就是前半部分讲的unconsolidated sediments or cemeted
sediments与否的问题。后半部分就是提出了porosity的概念,然后问了一个水的去留和这个porosity的关系。
那我们在选第三个的时候,我们发现可以明显排除4,5,6,因为太细节了。那1就选上了。 |
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