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文中通过史前大型动物的灭绝是想说明
[A] 大型动物在环境发生变化的时候更容易受到伤害
[B] 随着大型动物的灭绝,小型动物却生存了下来
[C] 大型海洋动物现在可能面临同样的威胁
[D] 生长缓慢的鱼类比生长快速的鱼类活得更久
32. We can infer form Dr Myers and Dr. Worm’s paper that
[A] the stock of large predators in some old fisheries has reduced by 90%
[B] there are only half as many fisheries are there were 15 years ago
[C] the catch sizes in new fisheries are only 20% of the original amount
[D] the number of larger predators dropped faster in new fisheries than in the old
[答案] A
[解题思路]
文章第二段最后两句话说“According to their latest paper published in Nature, the biomass of large predators (animals that kill and eat other animals) inanes fishery is reduced on average by 80% within 15 years of the start of exploitation. In some long-fished areas, it has halved again since then”(根据他们最近在《自然》杂志上发表的文章,在一个新渔场中大型食肉海洋生物(一种杀死并吃掉其它动物的生物)的总量在15年的时间里平均减少了80%。而在一些大型的捕鱼场,这个数字又进一步减半)。15年平均减少了80%,15年之后又减少了一半,(也就是20%中的10%),加起来是90%,因此正确答案是A。B、C选项明显不正确。但是D选项有很强的干扰性,因为该选项从某种意义上来说是正确的,但是没有A选项的表述具体和精确。
[题目译文]
我们可以从Myers和Worm博士的论文中推断出
[A] 在一些老渔场,大型肉食鱼类的数量减少了90%
[B] 现在的渔场数量只是15年前的一半
[C] 新渔场的捕鱼量只有原来的20%
[D] 新渔场大型肉食鱼类的数量下降比老渔场快
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