求助 GWD-26-7。9 马上要考了~~请大家来看看

blueice

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

答案是A    我怎么觉得是B呢？

The primary purpose of the pas-

sage 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

答案是E   我选C  虽然觉得C不一定对~~但至少E肯定错啊~~

[此贴子已经被作者于2007-6-14 21:36:57编辑过]

heyii

第一个是选A。这些researcher只是说P可以分类在Odorant下面，而这种Odorant是一个chemical可以被consciously的感知到的。但是她没说这些researcher就认为P是通过VNO被感知。所以选A。

我对最后一个也有问题！E怎么会对了= =
谁来解答一下?