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为了帮助大家高效备考GRE,新东方在线GRE频道为大家带来“GRE阅读模拟在线练习附答案二百四十三”,希望对大家GRE备考有所帮助。更多精彩尽请关注新东方在线GRE频道!
One explanation for the tendency of animals to be more vigilant in smaller groups than in larger ones assumes that the vigilant behavior—looking up, for example—is aimed at predators. If individuals on the edge of a group are more vigilant because they are at greater risk of being captured, then individuals on average would have to be more vigilant in smaller groups, because the animals on the periphery of a group form a greater proportion of the whole group as the size of the group diminishes
. However, a different explanation is necessary in cases where the vigilant behavior is not directed at predators. J. Krebs has discovered that great blue herons look up more often when in smaller flocks than when in larger ones, solely as a consequence of poor feeding conditions. Krebs hypothesizes that the herons in smaller flocks are watching for herons that they might follow to better feeding pools, which usually attract larger numbers of the birds.
Which of the following best describes the relationship of the second paragraph to the first?
A.he second paragraph relies on different evidence in drawing a conclusion similar to that expressed in the first paragraph.
B.The second paragraph provides further elaboration on why an assertion made at the end of the first paragraph proves to be true in most cases.
C.The second paragraph provides additional information in support of a hypothesis stated in the first paragraph.
D.The second paragraph provides an example of a case in which the assumption described in the first paragraph is unwarranted.
E.The second paragraph describes a phenomenon that has the same cause as the phenomenon described in the first paragraph.
It can be inferred from the passage that the author of the passage would be most likely to agree with which of the following assertions about vigilant behavior?
A.The larger the group of animals, the higher the probability that individuals in the interior of the group will exhibit vigilant behavior.
B.Vigilant behavior exhibited by individuals in small groups is more effective at warding off predators than the same behavior exhibited by individuals in larger groups.
C.Vigilant behavior is easier to analyze in species that are preyed upon by many different predators than in species that are preyed upon by relatively few of them.
D.The term "vigilant," when used in reference to the behavior of animals, does not refer exclusively to behavior aimed at avoiding predators.
E.The term "vigilant," when used in reference to the behavior of animals, usually refers to behavior exhibited by large groups of animals.
The passage provides information in support of which of the following assertions?
A.The avoidance of predators is more important to an animal's survival than is the quest for food.
B.Vigilant behavior aimed at predators is seldom more beneficial to groups of animals than to individual animals.
C.Different species of animals often develop different strategies for dealing with predators.
D.The size of a group of animals does not necessarily reflect its success in finding food.
E.Similar behavior in different species of animals does not necessarily serve the same purpose.
正确答案:D D E
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