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该题平均耗时:4m38s,平均正确率:26.6% 添加做题笔记

There is no consensus among researchers regarding what qualifies a substance as a pheromone. While most agree on a basic definition of pheromones as chemicals released by one individual of a species which, when detected by another individual of the same species, elicit a specific behavioral or physiological response, some researchers also specify (10) that the response to pheromones must be unconscious. In addition, the distinction between pheromones and odorants— chemicals that are consciously detected as odors---can be blurry, and some researchers classify pheromones as a type of odorant. Evidence that pheromone responses may not involve conscious odor perception comes from the finding that in many species, pheromones are processed by the vomeronasal (or accessory olfactory) system, which uses a special structure in the nose, the vomeronasal organ (VNO), to receive chemical signals. The neural connections between the VNO and the brain are separate from those of the main olfactory system, whose processing of odorants triggers sensations of smell. But while the VNO does process many animal pheromone signals, not all animal pheromones work through the VNO. Conversely, not all chemical signals transmitted via the VNO qualifyas pheromones. For example, garter snakes detect a chemical signal from earthworms—one of their favorite foods—via

the VNO, and they use this signal to track their prey.

The primary purpose of the passage is to


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  • 分析B选项
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  • 分析C选项
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  • 分析E选项
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网友解析

当前版本由 aaaaa 更新于2015-11-23 11:35:30感谢由 aaaaa 对此题目的解答所做出的贡献。

原文第一句”There is no consensus among researchers regarding what qualifies a substance as a pheromone.“应该是中心句。所以文章主要是说对于pheromone的分类大家一直有分歧”,后面的正文也是举了几个例子,说明pheromone和odorants之间容易混淆,以及通过VNO来分类也会造成分歧,等等。


A主要比较了VNO和olfactory,和pheromone无关。

B 总结了关于VNO在嗅觉分辨中的作用和角色,和pheromone无关。

C是”提出了关于pheromone组成成分(what constitutes a pheromone),和所说的定义混淆无关。

D是“提出了一个基于最近研究发现的pheromone的定义”,但是原文恰恰是说没有清楚的定义,所以错误。

E是“长岛关于应该将pheromone归为一类odorant”。看样子就这个比较相关,虽然也不是心目中最完美的答案。但是因为其他都不相关,正确。





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  • 用户头像

    RagingJack

    应该是C
    4楼  | 2017-11-01 06:59:26 回复
    • 评论用户头像
      外面: 怎么理解C

      2018-03-21 20:27:43 回复

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    艾垣汐爱吃萝卜

    正确答案是C
    3楼  | 2017-08-15 18:46:22 回复
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    lgw1490289900

    这个答案错了 正确答案应该是C
    2楼  | 2017-05-23 07:47:41 回复
  • 用户头像

    Jerrywin

    正确答案是C
    1楼  | 2017-04-05 13:21:22 回复
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