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气候变暖导致许多生物个体变小这一现象,气候变化已对浮游生物产生了有害影响,人类需要尽快采取措施.
解答 67.D.主旨大意题.全文主要说明了气候变暖导致许多生物个体变小这一现象,因此随着天气变暖物种变少最适合作本文标题;故选D.
68.A.词义猜测题.根据句中的but可知,画线词所在部分与画线词前面的内容"大气中二氧化碳的增加将使生物个体变大"是转折关系,从而可以推测气温、湿度、营养等的变化对生物的影响战胜了二氧化碳增加的好处,即实际上生物个体变小了;故选A.
69.B.细节理解题.第三段研究人员提到"We do not yet know the exact mechanisms involved",其中"the exact mechanisms"指的是气候变暖影响生物个体大小的确切原理,故选B.
70.A.细节理解题.根据第四段最后一句"There is a recent report on warmer temperatures'negative effects on plankton(浮游生物),the base of the marine ecosystem."可知,气候变化已对浮游生物产生了有害影响,因此大家对此事担忧的;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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