百思不得其解的一道题，大家帮忙看看

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By 1950, the results of attempts to relate brain processes to mental experience appeared rather discouraging. Herring suggested that different modes of
Line sensation, such as pain, taste, and color, might be
5 correlated with the discharge of specific kinds of nervous energy. However, subsequently developed methods of recording and analyzing nerve potentials failed to reveal any such qualitative diversity. Although qualitative variance among nerve energies was never rigidly
10 disproved, the doctrine was generally abandoned in favor of the opposing view, namely, that nerve impulses are essentially homogeneous in quality and are transmitted as ―common currency‖ throughout the nervous system. According to this theory, it is not the quality of the
15 sensory nerve impulses that determines the diverse conscious sensations they produce, but rather the different areas of the brain into which they discharge, and there is some evidence for this view. In one experiment, when an electric stimulus was applied to a given sensory field of
20 the cerebral cortex of a conscious human subject, it produced a sensation of the appropriate modality for that particular locus, that is, a visual sensation from the visual cortex, an auditory sensation from the auditory cortex, and so on. However, cortical locus, in itself, turned out to
25 have little explanatory value.

3. Which of the following best summarizes the
author‘s opinion of the suggestion that different
areas of the brain determine perceptions produced
by sensory nerve impulses?
(A) It is a plausible explanation, but it has not been
completely proved.
(B) It is the best explanation of brain processes
currently available.
(C) It is disproved by the fact that the various areas
of the brain are physiologically very similar.
(D) There is some evidence to support it, but it fails
to explain the diversity of mental experience.
(E) There is experimental evidence that confirms its
correctness.

答案D，文中在哪里提到了这种假说不能解释diversity of mental experience了啊？

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大家做36套的时候没这个困惑么？