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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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Resin is a plant secretion that hardens when exposed to air; fossilized resin is called amber. Although Pliny in the first century recognized that amber was produced from "marrow discharged by trees," amber has been widely misunderstood to be a semiprecious gem and has even been described in mineralogy textbooks. Confusion also persists surrounding the term "resin,"which was defined before rigorous chemical analyses were available. Resin is often confused with gum, a substance produced in plants in response to bacterial infections, and with sap, an aqueous solution transported through certain plant tissues. Resin differs from both gum and sap in that scientists have not determined a physiological function for resin.

In the 1950s, entomologists posited that resin may function to repel or attract insects. Fraenkel conjectured that plants initially produced resin in nonspecific chemical responses to insect attack and that, over time, plants evolved that produced resin with specific repellent effects. But some insect species, he noted, might overcome the repellent effects, actually becoming attracted to the resin. This might induce the insects to feed on those plants or aid them in securing a breeding site. Later researchers suggested that resin mediates the complex interdependence, or "coevolution," of plants and insects over time. Such ideas led to the development of the specialized discipline of chemical ecology, which is concerned with the role of plant chemicals in interactions with other organisms and with the evolution and ecology of plant antiherbivore chemistry (plants' chemical defenses against attack by herbivores such as insects).

【OG20-P433-541题】

The author refers to "bacterial infections" most likely in order to (highlight)

  • 分析A选项
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  • 分析B选项
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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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暂无雷哥网文字解析
当前版本由 百香果蜂蜜茶 更新于2017-08-10 15:36:33 感谢由 百香果蜂蜜茶 对此题目的解答所做出的贡献。

这一题比较简单,选A  我们直接在原文里找到原句 Resin is often confused with gum, a
substance produced in plants in response to bacterial infections, 我们可以看见
bacterial infections 出现在了 “gum”的同位语部分里,所有都是用来解释 gum 的属性,
对于本文结构或观点或走向并没有起到什么作用, 所以答案一目了然选A


题目讨论 8条评论)

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    浪逐曲奇

    错选了E example。。。。。。
    0 0 回复 2019-09-15 19:44:26
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    Joyce L

    physiological function植物生理功能包括:植物的物质代谢、能量转化和生长发育等的规律与机理、调节与控制以及植物体内外环境条件对其生命活动的影响
    0 0 回复 2019-08-05 01:03:01
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    peterbearpan

    文章说resin和gum被混淆,gum实际是一种因植物 bacterial infections而产生的物质(暗含:以前人们认为resin也有这个功能)。所以,这里就是通过说gum的功能暗示resin被错认的功能。和“(E选项)举例说明resin特性的混淆是如何产生的”无关,如果要说如何产生的,可能会解释,resin和gum颜色、气味、质感很相像,所以被误认。
    0 0 回复 2019-03-29 10:03:30
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    zhangxiao720

    我还以为需要考虑文章结构啥的,结果就是个同位语,不要想太多!!!
    2 0 回复 2018-11-10 12:21:31
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    朱大帅

    同位语,不要想太多 就是将gum的作用
    1 0 回复 2018-10-26 21:06:41
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    小运0804

    是后面一句有总结physiological functions,前面一句的同位语都是这个内容,还是要看前后两句
    0 0 回复 2017-11-19 16:16:53
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    Manning_0715

    这种highlight的细节题,如果原句有答案,就不能跳句,就在本句找
    0 0 回复 2017-09-30 10:13:43
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    百香果蜂蜜茶

    这一题比较简单,选A  我们直接在原文里找到原句 Resin is often confused with gum, a substance produced in plants in response to bacterial infections, 我们可以看见 bacterial infections 出现在了 “gum”的同位语部分里,所有都是用来解释 gum 的属性, 对于本文结构或观点或走向并没有起到什么作用, 所以答案一目了然选A
    0 0 回复 2017-08-09 15:16:44
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