【简介】感谢网友“雕龙文库”参与投稿，这里小编给大家分享一些，方便大家学习。
新gre考试实施以来，参加了新版gre考试的考生都觉得阅读部分的题难度增加了，这主要是由于新gre考试逻辑阅读需要考生的逻辑反应一定要比以前更快，可能考生还是有点不习惯，或是没有准备充足。那么，接下来的几天，小编将给大家搜索整理一些新gre考试逻辑阅读的练习题，希望考生能从平日的练习中总结规律，找到解题技巧。
Flatfish, such as the flounder, are among the few
vertebrates that lack approximate bilateral symmetry
. Most striking among
5 the many asymmetries evident in an adult flatfish is eye
placement: before 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
10 starry flounder species can be either left-eyed
or right-eyed.
In the waters between the United States and Japan,
the starry flounder populations vary from about 50 percent
left-eyed off the United States West Coast, through about 70 percent
15 left-eyed halfway between the United States and Japan, to
nearly 100 percent left-eyed off the Japanese coast.获得更多gre考试咨询点击进入免费咨询顾问或联系QQ客服：800004500
Biologists call this kind of gradual variation over a certain
geographic rang a cline and interpret clines as strong
indications that the variation is adaptive, a
20 response to environmental differences. For the
starry flounder this interpretation implies that a
geometric difference is adaptive, that left-eyedness
in the Japanese starry flounder has been selected for, which provokes a
25 perplexing questions: what is the selective advantage in
having both eyes on one side rather than on the other?
The ease with which a fish can reverse the effect of the sidedness
of its eye asymmetry simply by turning
around has caused biologists to study internal anatomy,
30 especially the optic nerves, for the answer. In all flatfish
the optic nerves cross, so that the right optic nerve is joined
to the brains left side and vice versa. This crossing introduces
an asymmetry, as one optic nerve must
cross above or below the other. G. H. Parker
35 reasoned that if, for example, a flatfishs left 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 left-eyed variety would be selected against, since in a
40 starry flounder the left optic nerve is uppermost.
The problem with the above explanation is that the
Japanese starry flounder population is almost exclusively
left-eyed, and natural selection never promotes a purely
less advantageous variation. As other explanations
45 proved equally untenable, biologists concluded that
there is no important adaptive difference between
left- eyedness and right-eyedness, and that the
two characteristics are genetically associated with some
other adaptively significant characteristic. This
50 situation is one commonly encountered by
evolutionary biologists, who must often decide
whether a characteristic is adaptive or selectively neutral.
As for the left-eyed and right-eyed flatfish,
their difference, however striking, appears to be an
55 evolutionary red herring.
10. According to the passage, starry flounder differ from most other species of flatfish in that starry flounder
are not basically bilaterally symmetric
do not become asymmetric until adulthood
do not all share the same asymmetry
have both eyes on the same side of the head
tend to cluster in only certain geographic regions For the following question, consider each of the choices separately and select all that apply
11. The author would be most likely to agree with which of the following statements about left-eyedness and right-eyedness in the starry flounder?
□A They are adaptive variations by the starry flounder to environmental differences.
□B They do not seem to give obvious selective advantages to the starry flounder.
□C They occur in different proportions in different locations.
12. According to the passage, a possible disadvantage associated with eye migration in flatfish is that the optic nerves can
adhere to one another
detach from the eyes
cross
stretch
twist
13. Which of the following best describes the organization of the passage as a whole?
A phenomenon is described and an interpretation presented and rejected.
A generalization is made and supporting evidence is supplied and weighed.
A contradiction is noted and a resolution is suggested and then modified.
A series of observations is presented and explained in terms of the dominant theory.
A hypothesis is introduced and corroborated in the light of new evidence.
答案：C/BC/E/A
以上即是阅读练习题，对于新gre考试逻辑阅读，考生除了采取题海战术，其实更应该做的就是总结。如果能从平日的练习中找到解新gre考试逻辑阅读题的思路，那么，要比采取题海战术更好。
新gre考试实施以来，参加了新版gre考试的考生都觉得阅读部分的题难度增加了，这主要是由于新gre考试逻辑阅读需要考生的逻辑反应一定要比以前更快，可能考生还是有点不习惯，或是没有准备充足。那么，接下来的几天，小编将给大家搜索整理一些新gre考试逻辑阅读的练习题，希望考生能从平日的练习中总结规律，找到解题技巧。
Flatfish, such as the flounder, are among the few
vertebrates that lack approximate bilateral symmetry
. Most striking among
5 the many asymmetries evident in an adult flatfish is eye
placement: before 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
10 starry flounder species can be either left-eyed
or right-eyed.
In the waters between the United States and Japan,
the starry flounder populations vary from about 50 percent
left-eyed off the United States West Coast, through about 70 percent
15 left-eyed halfway between the United States and Japan, to
nearly 100 percent left-eyed off the Japanese coast.获得更多gre考试咨询点击进入免费咨询顾问或联系QQ客服：800004500
Biologists call this kind of gradual variation over a certain
geographic rang a cline and interpret clines as strong
indications that the variation is adaptive, a
20 response to environmental differences. For the
starry flounder this interpretation implies that a
geometric difference is adaptive, that left-eyedness
in the Japanese starry flounder has been selected for, which provokes a
25 perplexing questions: what is the selective advantage in
having both eyes on one side rather than on the other?
The ease with which a fish can reverse the effect of the sidedness
of its eye asymmetry simply by turning
around has caused biologists to study internal anatomy,
30 especially the optic nerves, for the answer. In all flatfish
the optic nerves cross, so that the right optic nerve is joined
to the brains left side and vice versa. This crossing introduces
an asymmetry, as one optic nerve must
cross above or below the other. G. H. Parker
35 reasoned that if, for example, a flatfishs left 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 left-eyed variety would be selected against, since in a
40 starry flounder the left optic nerve is uppermost.
The problem with the above explanation is that the
Japanese starry flounder population is almost exclusively
left-eyed, and natural selection never promotes a purely
less advantageous variation. As other explanations
45 proved equally untenable, biologists concluded that
there is no important adaptive difference between
left- eyedness and right-eyedness, and that the
two characteristics are genetically associated with some
other adaptively significant characteristic. This
50 situation is one commonly encountered by
evolutionary biologists, who must often decide
whether a characteristic is adaptive or selectively neutral.
As for the left-eyed and right-eyed flatfish,
their difference, however striking, appears to be an
55 evolutionary red herring.
10. According to the passage, starry flounder differ from most other species of flatfish in that starry flounder
are not basically bilaterally symmetric
do not become asymmetric until adulthood
do not all share the same asymmetry
have both eyes on the same side of the head
tend to cluster in only certain geographic regions For the following question, consider each of the choices separately and select all that apply
11. The author would be most likely to agree with which of the following statements about left-eyedness and right-eyedness in the starry flounder?
□A They are adaptive variations by the starry flounder to environmental differences.
□B They do not seem to give obvious selective advantages to the starry flounder.
□C They occur in different proportions in different locations.
12. According to the passage, a possible disadvantage associated with eye migration in flatfish is that the optic nerves can
adhere to one another
detach from the eyes
cross
stretch
twist
13. Which of the following best describes the organization of the passage as a whole?
A phenomenon is described and an interpretation presented and rejected.
A generalization is made and supporting evidence is supplied and weighed.
A contradiction is noted and a resolution is suggested and then modified.
A series of observations is presented and explained in terms of the dominant theory.
A hypothesis is introduced and corroborated in the light of new evidence.
答案：C/BC/E/A
以上即是阅读练习题，对于新gre考试逻辑阅读，考生除了采取题海战术，其实更应该做的就是总结。如果能从平日的练习中找到解新gre考试逻辑阅读题的思路，那么，要比采取题海战术更好。
