GRE阅读速度提不上来很捉急？看最新11月5日GRE阅读逻辑机经来加速

2017年11月01日14:37 来源：小站教育作者：小站GRE编辑

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短篇阅读

What makes a worker ant perform one particular task rather than another? From the 1970s to the mid-1980s, researchers emphasized internal factors within individual ants, such as polymorphism, the presence in the nest of workers of different shapes and sizes, each suited to a particular task. Other elements then considered to have primary influence upon an ant’s career were its age—it might change tasks as it got older—and its genetics. However, subsequent ant researchers have focused on external prompts for behavior. In advocating this approach, Deborah Gordon cites experiments in which intervention in a colony’s makeup perturbed worker activity. By removing workers or otherwise altering the nest conditions, researchers were able to change the tasks performed by individual workers.

It can be inferred from the passage that Gordon and earlier researchers would agree with which of the following statements about worker ants?

A. Disruption of the nest can affect workers’ roles.

B. Genetics predominates over other factors in determining a worker ant’s role.

C. An individual worker’s tasks can change during its lifetime.

正确答案

C

题目解析

disruption of the nest 是在文章的后一部分在讨论DG的实验的时候提出来的新的结论，显然这个是不能被earlier researchers认可的。, researchers emphasized internal factors within individual ants, such as polymorphism, the presence in the nest of workers of different shapes and sizes, each suited to a particular task. Other elements then considered to have primary influence upon an ant’s career were its age—it might change tasks as it got older—and its genetics这里面出现的才是二者所共同认可的。所以A选项错误。 B选项，文章显然是没有说过genetics是predominate的，所有的因素没有出现一个排序，B选项错误。 既然年龄可以是一个影响因子，那么年龄变化，task也该变化，即在lifetime中task是改变的。C选项正确。

长篇阅读

What causes a helix in nature to appear with either a dextral (right-handed, or clockwise) twist or a sinistral (left-handed, or counterclockwise) twist is one of the most intriguing puzzles in the science of form. Most spiral-shaped snail species are predominantly dextral. But at one time, handedness (twist direction of the shell) was equally distributed within some snail species that have become predominantly dextral or, in a few species, predominantly sinistral. What mechanisms control handedness and keep left-handedness rare?

It would seem unlikely that evolution should discriminate against sinistral snails if sinistral and dextral snails are exact mirror images, for any disadvantage that a sinistral twist in itself could confer on its possessor is almost inconceivable. But left- and right-handed snails are not actually true mirror images of one another. Their shapes are noticeably different. Sinistral rarity might, then, be a consequence of possible disadvantages conferred by these other concomitant structural features. In addition, perhaps left- and right-handed snails cannot mate with each other, having incompatible twist directions. Presumably an individual of the rarer form would have relative difficulty in finding a mate of the same hand, thus keeping the rare form rare or creating geographically separated right- and left-handed populations.

But this evolutionary mechanism combining dissymmetry, anatomy, and chance does not provide an adequate explanation of why right-handedness should have become predominant. It does not explain, for example, why the infrequent unions between snails of opposing hands produce fewer offspring of the rarer than the commoner form in species where each parent contributes equally to handedness. Nor does it explain why, in a species where one parent determines handedness, a brood is not exclusively right- or left-handed when the offspring would have the same genetic predisposition. In the European pond snail Lymnaea peregra, a predominantly dextral species whose handedness is maternally determined, a brood might be expected to be exclusively right- or left-handed—and this often occurs. However, some broods possess a few snails of the opposing hand, and in predominantly sinistral broods, the incidence of dextrality is surprisingly high.

Here, the evolutionary theory must defer to a theory based on an explicit developmental mechanism that can favor either right- or left-handedness. In the case of Lymnaea peregra, studies indicate that a dextral gene is expressed during egg formation; i.e., before egg fertilization, the gene produces a protein, found in the cytoplasm of the egg, that controls the pattern of cell division and thus handedness. In experiments, an injection of cytoplasm from dextral eggs changes the pattern of sinistral eggs, but an injection from sinistral eggs does not influence dextral eggs. One explanation for the differing effects is that all Lymnaea peregra eggs begin left-handed but most switch to being right-handed. Thus the path to a solution to the puzzle of handedness in all snails appears to be as twisted as the helix itself.

1. The second paragraph of the passage is primarily concerned with offering possible reasons why

A. it is unlikely that evolutionary mechanisms could discriminate against sinistral snails

B. sinistrality is relatively uncommon among snail species

C. dextral and sinistral populations of a snail species tend to intermingle

D. a theory based on a developmental mechanism inadequately accounts for the predominance of dextrality across snail species

E. dextral snails breed more readily than sinistral snails, even within predominantly sinistral populations

正确答案

B

题目解析

线索很明显在第二段. A选项为误导选项,与第二段的第一句很像,如果只看这句就做题可能会被误导. 但题目问的是"offering possible reasons" why, 这是第二段中间的 Sinistral rarity might....才明说. 此句说造成的sinistral rarity这样的结果可能是也由下面concomitant structural features造成, 所以此句当然也就是那些possible reasons要解释的.

2. Which of the following accurately describes the relationship between the evolutionary and developmental theories discussed in the passage?

A. Although the two theories reach the same conclusion, each is based on different assumptions.

B. They present contradictory explanations of the same phenomenon.

C. The second theory accounts for certain phenomena that the first cannot explain.

D. The second theory demonstrates why the first is valid only for very unusual, special cases.

E. They are identical and interchangeable in that the second theory merely restates the first in less technical terms.

正确答案

C

题目解析

A direct contradiction, 定位第四段第一句the evolutionary theory must defer to a theory based on an explicit developmental

(defer to = 服从) 表示 evolutionary = developmental，所以 assumptions 应当相同，因此不选。

B one word wrong, “contradictory”, 它们两者都表示对旋的无法理解，而不是对立矛盾，因此不选。

C 正确，定位第四段的cytoplasm，从evolutionary来看，是无法解释的，所以选C。

D 出现了only这种极端用词，所以错误。

E "identical and interchangeable"和文中developmental和evolutionary进行的研究直接相悖，所以错误。

3. It can be inferred from the passage that a predominantly sinistral snail species might stay predominantly sinistral for each of the following reasons EXCEPT for

A. a developmental mechanism that affects the cell-division pattern of snails

B. structural features that advantage dextral snails of the species

C. a relatively small number of snails of the same hand for dextral snails of the species to mate with

D. anatomical incompatibility that prevents mating between snails of opposing hands within the species

E. geographic separation of sinistral and dextral populations

正确答案

B

题目解析

A选项的理由可在最后一段找到; B,C,D,E选项的线索都在第二段,但B选项是advantage 'dextral' snails 而不是sinistral snails.

B中的structure feature在文中是用来解释右旋比左旋更有优势.而题目问的是,左旋物种一直保持左旋的塬因.即,structure feature可以解释左旋比右旋少,但是不能解释为何左旋物种一直保持左旋。

逻辑阅读

X-ray examination of a recently discovered painting—judged by some authorities to be a self-portrait by Vincent van Gogh—revealed an under image of a woman’s face. Either van Gogh or another painter covered the first painting with the portrait now seen on the surface of the canvas. Because the face of the woman in the under image also appears on canvases van Gogh is known to have painted, the surface painting must be an authentic self-portrait by van Gogh.

The conclusion is properly drawn if which of the following is assumed?

A. If a canvas already bears a painted image produced by an artist, a second artist who uses the canvas to produce a new painting tends to be influenced by the style of the first artist.

B. Many painted canvases that can be reliably attributed to van Gogh contain under images of subjects that appear on at least one other canvas that van Gogh is known to have painted.

C. Any painted canvas incorrectly attributed to van Gogh would not contain an under image of a subject that appears in authentic paintings by that artist.

D. A painted canvas cannot be reliably attributed to an artist unless the authenticity of any under image that painting might contain can be reliably attributed to the artist.

E. A painted canvas cannot be reliably attributed to a particular artist unless a reliable x-ray examination of the painting is performed.

正确答案

C

题目解析

文章的逻辑链是新发现了一幅梵高的画里的底画中有一个女人的脸，而这张脸出现在别的梵高画中，因此新发现的这张梵高画必定是真品。选项C则是把这句话做了个双重否定，也就是任何不是梵高的画，一定不会包含曾在梵高的真画里出现过的底画的主题。意思是一样的，所以C正确。选项A和B里提到的作画风格和相似之处与本文逻辑推论链无关，因此错误。选项D和E则是推出了一个广义上的判断标准，也不适用于具体情况，因此也是错误的。

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