分析 本文主要讲述两栖动物正在快速灭绝的原因.
解答 81.The sharp drops in the populations ofamphibians from over 25 countries
82.It kills off delicate amphibian embryos.
83.absorbing/blocking the (harmful) ultravioletradiation
84.Human interference,increased ultravioletradiation and new infectious diseases
81.The sharp drops in the populations ofamphibians from over 25 countries 细节题. More than 25 countries are reporting…"说明了两栖动物数量急剧下降,濒临灭绝这一事实."The sharp drops in the populations of amphibians from over 25 countries"符合题意,在句中作主语
82.It kills off delicate amphibian embryos.细节题.由第三段"This makes the rain acidic and thus kills off delicate amphibian embryos"可知酸雨对两栖动物的破坏性力量在于它会杀死动物的胚胎.
83.absorbing/blocking the (harmful) ultravioletradiation 细节题. Luckily for us,ultraviolet rays are blocked by a thick layer of ozone above the earth's atmosphere"可知臭氧层能够阻挡紫外线,防止人们晒伤.absorbing/blocking the (harmful) ultraviolet radiation 与此表意一致.
84.Human interference,increased ultravioletradiation and new infectious diseases 细节题.文中指出了两栖动物濒临灭绝的三点原因,由第三段、第五段及最后一段可得关键词:human interference、increased ultraviolet radiation 及 new infectious diseases.
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