GWD TN17-Q9 pheromone和odorant那篇GWD和PREP答案不一样，求分析！

tintinc

GWD 26-Q7 to Q9
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 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.

Q9: The primary purpose of the passage is to  
A.    compare and contrast the ways in which the vomeronasal organ and the main olfactory systern process chemicals.
B.    summarize the debate over the role the vomeronasal organ plays in odor perception
C.    present some of the issues involved in the debate over what constitutes a pheromone
D.    propose a new definition of pheromones based on recent research
E.    argue that pheromones should be classified as a type of odorant

提问：GWD给的答案是E，PREP答案是C，小女子很不好意思和谁都不一样，选了B。没了主意，求NN分析！谢谢！
[attachimg]85676[/attachimg]

stella1220

选C，原文第一句的改写。

E的意思跟原文相反。
E说：argue that pheromones should be classified as a type of odorant （作者的目的是要证明pheromones是香气的一种），但是全文都在证明phermonoes不是香气。