分析 本文属于说明文阅读,作者通过这篇文章主要向我们描述了大型动物栖息在树冠层的优点,介绍了大型动物倾向于支配雨林的上层树冠的科学知识.
解答 68.D.推理判断题.通读全文,可知文章主要讲大型动物栖息在树冠层的优点,因此整篇文章是对为什么大型动物倾向于支配雨林的上层树冠的解答;故选D.
69.C.细节理解题.根据文章第二段"Thus,in the trees,where protection from heat and cold may be scarce and conditions may be changeable,a small mammal may have trouble maintaining its body temperature"可知在树上,在冷和热的保护可能是稀缺的,条件可能是多变的,一个小的哺乳动物可能难以维持它的体温;故选C.
70.B.细节理解题.根据文章第三段"but small mammals are defeated,in the competition for food,by large ones that have their own strategies for browsing among tbod-rich twigs"可知大型动物的大小是在树冠上获取食物的优点;故选B.
71.A.细节理解题.根据文章最后一段"The forward movement of a small animal is seriously reduced by the air friction (摩擦) against the relatively large surface area of its body"可知空气对身体表面的摩擦使小哺乳动物跳跃从一个冠到另一个十分困难;故选A.
点评 考察学生的细节理解和推理判断能力,做细节理解题时一定要找到文章中的原句,和题干进行比较,再做出正确的选择.在做推理判断题不要以个人的主观想象代替文章的事实,要根据文章事实进行合乎逻辑的推理判断.
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