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OG20官方指南,建议同学们刷3遍。第一遍做题了解题型和考点,第二遍精刷,第三遍集中解决疑难问题。建议考生第一遍刷题采用官方正版纸质书籍,若遇到疑难问题,欢迎在此专区查阅解析,提供解析,参与题目讨论,与所有考生一起解决疑难问题。
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Carotenoids, a family of natural pigments, form an important part of the colorful signals used by many animals. Animals acquire carotenoids either directly (from the plants and algae that produce them) or indirectly (by eating insects) and store them in a variety of tissues. Studies of several animal species have shown that when choosing mates, females prefer males with brighter carotenoid- based coloration. Owens and Olson hypothesize that the presence of carotenoids, as signaled by coloration, would be meaningful in the context of mate selection if carotenoids were either rare or required for health. The conventional view is that carotenoids are meaningful because they are rare: healthier males can forage for more of the pigments than can their inferior counterparts. Although this may be true, there is growing evidence that carotenoids are meaningful also because they are required: they are used by the immune system and for detoxification processes that are important for maintaining health. It may be that males can use scarce carotenoids either for immune defense and detoxification or for attracting females. Males that are more susceptible to disease and parasites will have to use their carotenoids to boost their immune systems, whereas males that are genetically resistant will use fewer carotenoids for fighting disease and will advertise this by using the pigments for flashy display instead.

【OG20-P422-518题】

The passage implies which of the following about the insects from which animals acquire carotenoids?

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  • 分析C选项
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  • 分析D选项
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  • 分析E选项
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题目讨论 7条评论)

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    373961gg

    文章中说动物只能直接或间接摄取C物质。直接的方式是吃带有C物质的植物,间接方式是吃带有C物质的昆虫。昆虫也是动物中的一种,所以insects也只能从这两种方式中的一种获取C,无论是直接还是间接,昆虫本身都不生产C物质
    0 0 回复 2020-08-23 11:48:54
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    该用户没有名字

    they说的到底是insect还是animal
    0 0 回复 2019-11-11 11:05:23
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    Zhazha

    Animals acquire carotenoids either directly (from the plants and algae that produce them) or indirectly (by eating insects) 
    indirectly 就是说非直接,就是insects自己不产生C。insect 吃植物,动物吃insects,间接。
    1 0 回复 2019-10-23 17:00:50
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    杜一凡

    原文说plants and algae是获取carotenoids的直接来源,它们可以产生carotenoids;那么根据定位句信息可以推断获取carotenoids的间接来源——昆虫是无法直接产出carotenoids的,不然如果昆虫也可以自己产生色素,那为什么吃昆虫不叫直接来源。
    2 0 回复 2019-07-30 09:24:56
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    shanzixiaodi

    第二句Animals acquire carotenoids either directly (from the plants and algae that produce them) or indirectly (by eating insects) 。植物和藻类可以直接有Carotenoids,但昆虫不能直接有,and store them in a variety of tissues.这个tissues是Animals的tissues。所以昆虫不能直接产生Carotenoids,个人认为选A
    0 0 回复 2019-02-07 10:43:12
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    独一无二的张喜喜

    这个题目应该怎么读,以为问题主语是insects,然后5个都不对。。。。。心累
    1 0 回复 2019-01-19 12:16:25
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    胡娆子

    定位文章第二句话,可以知道不管是direct或者indirect的方式,动物都不能自己产生carotenoids。其他应该都是无关选项
    0 0 回复 2018-11-29 16:31:41
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