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06年GRE模拟试题第4部分

2006-07-06 23:07

  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

  (5) edge of a group are more vigilant because they are at

  greater risk of being captured, then individuals on aver-

  age 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

  (10)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

  (15)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.

  17.It can be inferred from the passage that in species in

  which vigilant behavior is directed at predators, the

  tendency of the animals to be more vigilant in

  smaller groups than in larger ones would most likely

  be minimized if which of the following were true?

  (A) The vigilance of animals on the periphery of a

  group always exceeded that of animals located

  in its interior, even when predators were not

  in the area.

  (B) The risk of capture for individuals in a group

  was the same, whether they were located in

  the interior of the group or on its periphery.

  (C) Animals on the periphery of a group tended to

  be less capable of defending themselves from

  attack by predators than animals located in the

  interior of the group.

  (D) Animals on the periphery of a group tended to

  bear marks that were more distinctive to

  predators than animals located in the interior

  of the group.

  (E) Animals on the periphery of a group tended to

  have shorter life spans than animals located in

  the interior of the group.

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