掌握了gre阅读里的长难句，到了实战演习的时候了。gre阅读练习每日一篇帮助gre考生循序渐进地进行练习和总结。希望gre考生在进行gre阅读练习时，也按着考试时候的时间规定自己的练习，这样才能有效果。

　　Of Homer’s two epic poems, the Odyssey has always been more popular than the Iliad, perhaps because it includes more features of mythology that are accessible to readers. Its subject (to use Maynard Mack’s categories) is “life-as-spectacle,” for readers, diverted by its various incidents, observe its hero Odysseus primarily from without; the tragic Iliad, however, presents “life-as-experience”: readers are asked to identify with the mind of Achilles, whose motivations render him a not particularly likable hero. In addition, the Iliad, more than the Odyssey, suggests the complexity of the gods’ involvement in human actions, and to the extent that modern readers find this complexity a needless complication, the Iliad is less satisfying than the Odyssey, with its simpler scheme of divine justice. Finally, since the Iliad presents a historically verifiable action, Troy’s siege, the poem raises historical questions that are absent from the Odyssey’s blithely imaginative world.

　　17. The author uses Mack’s “categories” (lines 4-5) most probably in order to

　　(A) argue that the Iliad should replace the Odyssey as the more popular poem

　　(B) indicate Mack’s importance as a commentator on the Iliad and the Odyssey

　　(C) suggest one way in which the Iliad and the Odyssey can be distinguished

　　(D) point out some of the difficulties faced by readers of the Iliad and the Odyssey

　　(E) demonstrate that the Iliad and the Odyssey can best be distinguished by comparing their respective heroes

　　18. The author suggests that the variety of incidents in the Odyssey is likely to deter the reader from

　　(A) concentrating on the poem’s mythological features

　　(B) concentrating on the psychological states of the poem’s central character

　　(C) accepting the explanation that have been offered for the poem’s popularity

　　(D) accepting the poem’s scheme of divine justice

　　(E) accepting Maynard Mack’s theory that the poem’s subject is “life-as-spectacle”

　　19. The passage is primarily concerned with

　　(A) distinguishing arguments

　　(B) applying classifications

　　(C) initiating a debate

　　(D) resolving a dispute

　　(E) developing a contrast

　　20. It can be inferred from the passage that a reader of the Iliad is likely to have trouble identifying with the poem’s hero for which of the following reasons?

　　(A) The hero is eventually revealed to be unheroic.

　　(B) The hero can be observed by the reader only from without.

　　(C) The hero’s psychology is not historically verifiable.

　　(D) The hero’s emotions often do not seem appealing to the reader.

　　(E) The hero’s emotions are not sufficiently various to engage the reader’s attention.

　　Flatfish, such as the flounder, are among the few vertebrates that lack approximate bilateral symmetry (symmetry in which structures to the lt and right of the body’s midline are mirror images). Most striking among the many asymmetries evident in an adult flatfish is eye placement: bore maturity one eye migrates, so that in an adult flatfish both eyes are on the same side of the head. While in most species with asymmetries virtually all adults share the same asymmetry, members of the starry flounder (starry flounder: (美洲)箭齿鲽,星斑川鲽) species can be either lt-eyed (both eyes on the lt side of head) or right-eyed. In the waters between the United States and Japan, the starry flounder populations vary from about 50 percent lt-eyed off the United States West Coast, through about 70 percent lt-eyed halfway between the United States and Japan, to nearly 100 percent lt-eyed off the Japanese coast.

　　Biologists call this kind of gradual variation over a certain geographic range a “cline (cline: n.[生]渐变群(一种生态特征))” and interpret clines as strong indications that the variation is adaptive, a response to environmental differences. For the starry flounder this interpretation implies that a geometric difference (between fish that are mirror images of one another) is adaptive, that lt-eyedness in the Japanese starry flounder has been selected for, which provokes a perplexing questions: what is the selective advantage (selective advantage: 选择有利性) in having both eyes on one side rather than on the other?

　　The ease with which a fish can reverse the fect of the sidedness of its eye asymmetry simply by turning around has caused biologists to study internal anatomy, especially the optic nerves, for the answer. In all flatfish the optic nerves cross, so that the right optic nerve is joined to the brain’s lt side and vice versa. This crossing introduces an asymmetry, as one optic nerve must cross above or below the other. G. H. Parker reasoned that if, for example, a flatfish’s lt eye migrated when the right optic nerve was on top, there would be a twisting of nerves, which might be mechanically disadvantageous. For starry flounders, then, the lt-eyed variety would be selected against, since in a starry flounder the lt optic nerve is uppermost.

　　The problem with the above explanation is that the Japanese starry flounder population is almost exclusively lt-eyed, an natural selection never promotes a purely less advantageous variation. As other explanations proved equally untenable, biologists concluded that there is no important adaptive difference between lt-eyedness and right-eyedness, and that the two characteristics are genetically associated with some other adaptively significant characteristic. This situation is one commonly encountered by evolutionary biologists, who must often decide whether a characteristic is adaptive or selectively neutral. As for the lt-eyed and right-eyed flatfish, their difference, however striking, appears to be an evolutionary red herring (red herring: n.熏青鱼, 转移注意力的话).

　　21. According to the passage, starry flounder differ from most other species of flatfish in that starry flounder

　　(A) are not basically bilaterally symmetric

　　(B) do not become asymmetric until adulthood

　　(C) do not all share the same asymmetry

　　(D) have both eyes on the same side of the head

　　(E) tend to cluster in only certain geographic regions

　　22. The author would be most likely to agree with which of the following statements about lt-eyedness and right-eyedness in the starry flounder?

　　I. They are adaptive variations by the starry flounder to environmental differences.

　　II. They do not seem to give obvious selective advantages to the starry flounder.

　　III. They occur in different proportions in different locations.

　　(A) I only

　　(B) II only

　　(C) I and III only

　　(D) II and III only

　　(E) I, II, and III

　　23. According to the passage, a possible disadvantage associated with eye migration in flatfish is that the optic nerves can

　　(A) adhere to one another

　　(B) detach from the eyes

　　(C) cross

　　(D) stretch

　　(E) twist

　　24. Which of the following best describes the organization of the passage as a whole?

　　(A) A phenomenon is described and an interpretation presented and rejected.

　　(B) A generalization is made and supporting evidence is supplied and weighed.

　　(C) A contradiction is noted and a resolution is suggested and then modified.

　　(D) A series of observations is presented and explained in terms of the dominant theory.

　　(E) A hypothesis is introduced and corroborated in the light of new evidence.

　　25. The passage supplies information for answering which of the following questions?

　　(A) Why are Japanese starry flounder mostly lt-eyed?

　　(B) Why should the eye-sidedness in starry flounder be considered selectively neutral?

　　(C) Why have biologists recently become interested in whether a characteristic is adaptive or selectively neutral?

　　(D) How do the eyes in flatfish migrate?

　　(E) How did Parker make his discoveries about the anatomy of optic nerves in flatfish?

　　26. Which of the following is most clearly similar to a cline as it is described in the second paragraph of the passage?

　　(A) A vegetable market in which the various items are grouped according to place of origin

　　(B) A wheat field in which different varieties of wheat are planted to yield a crop that will bring the maximum profit

　　(C) A flower stall in which the various species of flowers are arranged according to their price

　　(D) A housing development in which the length of the front struts supporting the porch of each house increases as houses are built up the hill

　　(E) A national park in which the ranger stations are placed so as to be inconspicuous, and yet as easily accessible as possible

　　27. Which of the following phrases from the passage best expresses the author’s conclusion about the meaning of the difference between lt-eyed and right-eyed flatfish?

　　(A) “Most striking” (line 4)

　　(B) “variation is adaptive” (line 19)

　　(C) “mechanically disadvantageous” (lines 3738)

　　(D) “adaptively significant” (lines 48-49)

　　(E) “evolutionary red herring” (line 54)

答案：17-27：CBEDCDEABDE

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