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题库解析   >   态度题题型   >   RC456-470
    本题由hyman1提供
145次学习
RC456-470

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-P433-542题】

The author of the passage refers to Pliny most probably in order to

    <p>(A) give an example of how the nature of amber has been misunderstood in the past</p><p>(B)show that confusion about amber has long been more pervasive than confusion about resin</p><p>(C) make note of the first known reference to amber as a semiprecious gem</p><p>(D) point out an exception to a generalization about the history of people&#39;s understanding of amber&nbsp;</p><p>(E) demonstrate that Pliny believed amber to be a mineral</p><p><br/></p>
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答案:
D

这一题同

样定位到原文 “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” 我们在阅读的时候一定要注意情绪的转折, 这里在Pliny的前面用了Although 表达出一种转折的情绪! 说明尽管Pliny这样认为,可是其他人会那样认为..因此 Pliny是个例外.

A错 因为 Pliny并不是一个example

B错 因为resin和amber并没有作比较

C错在 Pliny 并不认为 resin是一种semiprecious gem

E错在 所提及内容文章中并未出现

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