gwd-26-7

有妖怪

Q7 to Q9

There 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.

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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 mem-

bers of the same species.

E.        pheromones do not always elicit

a specific behavioral or physio-

logical response

answer:a

我觉得是b

echo_cheng

same question

jennysong77

这道题好像应定位于：

In addition, the distinction between pheromones and odorants (添味剂)—chemicals that are consciously detected as odors---can be blurry, and some researchers classify pheromones as a type of odorant.