问一道gwd的题

There is no consensusamong researchers regarding what qualifies a substance as a pheromone. Whilemost agree on a basic definition of pheromones as chemicals released by oneindividual of a species which, when detected by another individual of thesame species, elicit a specific behavioral or physiological response, someresearchers also specify (10) that the response topheromones must be unconscious. In addition, the distinction betweenpheromones and odorants— chemicals that are consciously detected as odors---canbe blurry, and some researchers classify pheromones as a type of odorant. Evidence that pheromone responses may not involve consciousodor perception comes from the finding that in many species, pheromonesare processed by the vomeronasal (or accessory olfactory) system, which uses aspecial structure in the nose, the vomeronasal organ (VNO), to receive chemicalsignals. The neural connections between the VNO and the brain are separate fromthose of the main olfactory system, whose processing of odorants triggerssensations of smell. But while the VNO does process many animal pheromonesignals, not all animal pheromones work through the VNO. Conversely, not allchemical signals transmitted via the VNO quality as pheromones. For example, gartersnakes detect a chemical signal from earthworms—one of their favorite foods—viathe VNO, and they use this signal to track their prey.

Q7 A

It can be inferred from the passage that inclassifying pheromones as a type of odorant, the researchers referred to in line15 posit假定,认为that

A.     pheromones are perceived consciously

B.     ！most pheromones are processed by the VNO

C.     most chemical signals processed by the VNOare pheromones

D.     pheromone perception does not occurexclusively between members of the same species.

E.     pheromones do not always elicit a specificbehavioral or physiological response