31. From which is the text probably taken?
A. A biology textbook.
B. A health magazine.
C. A travel brochure.
D. A research paper.
【答案】28. B 29. A 30. C 31. D
【解析】
这是一篇说明文。本文讲述最近一项研究,动物不仅具有理解数字的能力,而且这一能力还对它们
的日常生活有着巨大的影响。
【28题详解】
推理判断题。根据第一段最后一句“Different groups of animals obviously developed this trait(特点)independently from others and that strongly indicates that it has to be of adaptive value.”以及第二段列举的例子可知,不同的动物群体明显地独立于其他动物发展出这种特殊的数字能力,这强烈地表明它必须具有适应性价值。由此可推知,动物具有的数字能力是为了生存需要。故选B。
【29题详解】
细节理解题。根据第三段第一句“Wolves are more likely to hunt successfully if they have the right number of wolves in their pack for the size of their prey(猎物): With prey like deer, only around six to eight wolves are needed, while hunting wild ox requires a pack of nine to thirteen.”可知,如果狼群中狼群的数量与猎物的大小相符,狼更有可能成功捕食:像鹿这样的猎物,只需要大约6到8只狼,而捕猎野牛则需要9到13只狼群。由此可知,数字能力在狼的狩猎中能帮助它们形成狩猎群体。故选A。【30题详解】
推理判断题。根据第二段Honeybees, for instance…; Also, for example, male frogs sing “advertisement” calls to attract females. ;第三段Wolves are more…和deer tend to live in large herds…可知,文章中作者
是通过列举honeybees, frogs, wolves, deer这些例子来说明的。故选C。
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