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【单选题】
下列有关非条件反射和条件反射的叙述中,错误的是( ) A.条件反射建立在非条件反射基础上B.条件反射必须在大脑皮层参与下才能发生C.条件反射是暂时的,可以消退,而非条件反射是永久的 D.条件反射的神经中枢都在脊髓的灰质中A.
B.
C.
D.
D
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