分析 本文屬于說明文閱讀,作者通過這篇文章主要向我們描述了大型動物棲息在樹冠層的優(yōu)點,介紹了大型動物傾向于支配雨林的上層樹冠的科學知識.
解答 68.D.推理判斷題.通讀全文,可知文章主要講大型動物棲息在樹冠層的優(yōu)點,因此整篇文章是對為什么大型動物傾向于支配雨林的上層樹冠的解答;故選D.
69.C.細節(jié)理解題.根據(jù)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"可知在樹上,在冷和熱的保護可能是稀缺的,條件可能是多變的,一個小的哺乳動物可能難以維持它的體溫;故選C.
70.B.細節(jié)理解題.根據(jù)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"可知大型動物的大小是在樹冠上獲取食物的優(yōu)點;故選B.
71.A.細節(jié)理解題.根據(jù)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"可知空氣對身體表面的摩擦使小哺乳動物跳躍從一個冠到另一個十分困難;故選A.
點評 考察學生的細節(jié)理解和推理判斷能力,做細節(jié)理解題時一定要找到文章中的原句,和題干進行比較,再做出正確的選擇.在做推理判斷題不要以個人的主觀想象代替文章的事實,要根據(jù)文章事實進行合乎邏輯的推理判斷.
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