標準GRE閱讀練習真題
編輯點評： GRE閱讀的'方法相信大家已經(jīng)積累了很多了，本文就為大家提供一些GRE閱讀的材料，大家來練一練，把平時學到的東西運用到實際中，也多多積累詞匯和句子，提高自己的閱讀能力。
每天做一些標準的GRE閱讀練習，有助于大家在GRE考試的復習過程中不斷地進行練習和總結(jié)。希望大家在進行GRE閱讀練習時，充分運用平時所積累的知識，這樣才能有效果。
The evolution of intelligence among early large mammals of the grasslands was due in great measure to the interaction between two ecologically synchronized groups of these animals, the hunting carnivores and the herbivores that they hunted. The interaction resulting from the differences between predator and prey led to a general improvement in brain functions; however, certain components of intelligence were improved far more than others.
The kind of intelligence favored by the interplay of increasingly smarter catchers and increasingly keener escapers is defined by attention that aspect of mind carrying consciousness forward from one moment to the next. It ranges from a passive, free-floating awareness to a highly focused, active fixation. The range through these states is mediated by the arousal system, a network of tracts converging from sensory systems to integrating centers in the brain stem. From the more relaxed to the more vigorous levels, sensitivity to novelty is increased. The organism is more awake, more vigilant; this increased vigilance results in the apprehension of ever more subtle signals as the organism becomes more sensitive to its surroundings. The processes of arousal and concentration give attention its direction. Arousal is at first general, with a flooding of impulses in the brain stem; then gradually the activation is channeled. Thus begins concentration, the holding of consistent images. One meaning of intelligence is the way in which these images and other alertly searched information are used in the context of previous experience. Consciousness links past attention to the present and permits the integration of details with perceived ends and purposes.
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