【OG24-767题】Most of the year, the hermit thrush, a North American songbird, eats a diet consisting mainly of insects, but in autumn, as the thrushes migrate to their Central and South American wintering grounds, they feed almost exclusively on wild berries. Wild berries, however, are not as rich in calories as insects, yet thrushes need to consume plenty of calories in order to complete their migration. One possible explanation is that berries contain other nutrients that thrushes need for migration and that insects lack.Which of the following, if true, most seriously calls into question the explanation given for the thrush’s diet during migration?_mofa留学圈mofaGRE在线题库系统_GRE在线搜题_GRE题库解析_GRE真题机经_GRE课程_GRE培训机构

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Most of the year, the hermit thrush, a North American songbird, eats a diet consisting mainly of insects, but in autumn, as the thrushes migrate to their Central and South American wintering grounds, they feed almost exclusively on wild berries. Wild berries, however, are not as rich in calories as insects, yet thrushes need to consume plenty of calories in order to complete their migration. One possible explanation is that berries contain other nutrients that thrushes need for migration and that insects lack.

Which of the following, if true, most seriously calls into question the explanation given for the thrush’s diet during migration?

Hermit thrushes, if undernourished, are unable to complete their autumn migration before the onset of winter. Insect species contain certain nutrients that are not found in wild berries. For songbirds, catching insects requires the expenditure of significantly more calories than eating wild berries does. Along the hermit thrushes’ migration routes, insects are abundant throughout the migration season. There are some species of wild berries that hermit thrushes generally do not eat, even though these berry species are exceptionally rich in calories.

正确答案： C

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题干翻译
秋天，当画眉鸟迁徙到中南美越冬地时，它们几乎只以野生浆果为食。然而，野生浆果不如昆虫富含卡路里，但画眉鸟为了完成迁徙需要消耗大量卡路里。一种可能的解释是浆果含有画眉鸟迁徙所需而昆虫缺乏的其他营养物质。以下哪项如果为真，最严重地质疑了对画眉鸟迁徙期间饮食的这一解释？ 逻辑链
Thrushes eat berries→Berries have special nutrients 问题类型
削弱题 推理过程
论点是浆果含有昆虫缺乏的、画眉鸟迁徙所需的其他营养物质所以画眉鸟吃浆果，要削弱该解释，需找出其他原因说明为什么画眉鸟选择吃浆果而非昆虫。 选项分析
A选项：画眉鸟营养不良就无法在冬季来临前完成秋季迁徙。只强调了营养对迁徙的重要性，未涉及为何选择浆果，与解释无关，排除。 B选项：昆虫含有野生浆果中没有的某些营养物质。但不确定这些营养物质是不是画眉鸟迁徙必需的，无法削弱，排除。 C选项：对于鸣禽来说，捕捉昆虫比吃野生浆果消耗的卡路里显著更多。说明画眉鸟选择浆果可能是因为获取浆果消耗卡路里少，而非浆果有特殊营养，削弱了解释，当选。 D选项：在画眉鸟的迁徙路线上，整个迁徙季节昆虫都很丰富。只能说明昆虫数量情况，不能解释画眉鸟为什么不吃昆虫而吃浆果，排除。 E选项：有一些画眉鸟一般不吃的野生浆果品种，尽管这些浆果品种卡路里含量极高。讨论的是部分浆果，与画眉鸟整体选择浆果的原因无关，排除。

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