GWD 26 Q9 请教！

怡然yiran

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  that the response to pheromones must beunconscious. 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 quality as 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.

什么是信息素尚无定论。信息素的基础定义：对同类起作用。一些研究者还特别说明对信息素的反应必须是无意识的。信息素与有气味的东西之间的区别很模糊，有些研究者把信息素归为有气味东西的一类。无意识的对信息素的反应的证据是，很多物种通过嗅觉系统（该系统用一个特殊的VNO来接收化学信息）处理信息素。VNO与大脑的神经连接有别于嗅觉系统与大脑的连接，后者处理气味触发嗅觉。但也有例外，并非所有动物的信息素通过VNO工作。反过来，并非所有通过VNO传递的化学信息就是信息素。例如，蛇通过VNO察觉蚯蚓的化学信号，以此来追踪食物。

Q9: The primary purpose of the passage is to

A. compare and contrast the waysin which the vomeronasal organand the main olfactory systernprocess chemicals.

B. summarize the debate over therole the vomeronasal organ plays in odor perception

C. present some of the issuesinvolved in the debate overwhat constitutes a pheromone

D. propose a new definition ofpheromones based on recentresearch

E. argue that pheromones should beclassified as a type of odorant

哪儿看出来是argue了，而且没觉得P应该被分类为O啊？！
求指点，谢谢！

暗地忍者

GWD此题答案有误。。应该是C

怡然yiran

嗷。。。。谢谢啦~

DeliciaAn

不啊。这道题目是E吧