GWD 26 Q9求救啊

kathy1988

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

 

答案是E 我很疑惑E的意思到底是作者赞成 pheromones should be
                    classified as a type of odorant还是不赞成呢?

 

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

 

答案是E 我很疑惑E的意思到底是作者赞成 pheromones should be
        classified as a type of odorant还是不赞成呢?

 

vivian128

同问同问~~nn快来解答

ozymendias

prep官方答案为C