再问GWD-26-Q7

glitters

 GWD-26-Q7There is no consensus among
researchers regarding what qualifies a
substance as a pheromone.
                   While most
Line agree on a basic definition of pheromones
(5) 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
(15) 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
(20) 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
(25) 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 phero-
(30) mones 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
(35) the VNO, and they use this signal to track
their prey.


-----------------------------------------
Q7
It can be inferred from the passage that in classifying pheromones as a type of
odorant, the researchers referred to in
               line 15 posit that
A.       pheromones are perceived
                   consciously
B.        most pheromones are processed
               by the VNO
C.       most chemical signals processed
               by the VNO are pheromones
D.       Pheromone perception does not
               occur exclusively between members of the same species.
E.        pheromones do not always elicit
               a specific behavioral or physiological response
为什么C不对呢？根据紫色部分7题问的那些人应该是反对紫色部分的，所以它们应该认为PHER...那个东西不是限制在同一物种之内的呀？    求教谢谢大家！

glitters

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