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发布时间：2006-06-22 13:29     点击：

    (C)establishing a direct link between early large mammals and their modern counterparts

    (D) analyzing the ecological basis for the dominance of some carnivores over other carnivores

    (E) demonstrating the importance of hormones in mental activity

    18. The author refers to a hungry lizard (line 55) primarily in order to

    (A) demonstrate the similarity between the hunting methods of mammals and those of nonmammals

    (B) broaden the application of his argument by including an insectivore as an example

    (C) make a distinction between higher and lower levels of consciousness

    (D) provide an additional illustration of the brutality characteristic of predators

    (E) offer an objection to suggestions that all animals lack consciousness

    19. It can be inferred from the passage that in animals less intelligent than the mammals discussed in the passage

    (A) past experience is less helpful in ensuring survival

    (B) attention is more highly focused

    (C) muscular coordination is less highly developed

    (D) there is less need for competition among species

    (E) environment is more important in estab- lishing the proper ratio of prey to predator

    20. The sensitivity described in lines 56-61 is most clearly an example of

    (A) "free-floating awareness" (lines 16-17)

    (B) "flooding of impulses in the brain stem" (lines 29-30)

    (C) "the holding of consistent images" (lines 31-32)

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