题干

美国科学家最近在对神经元的研究中发现,轴突可以将信号传回到神经元的细胞体,不同神经元的轴突之间也能互相“交流”,神经元还能在较长时间内将外部刺激存储和整合在轴突内,这些新发现颠覆了传统的教科书理论。上述材料表明
①思维和存在具有同一性          ②认识具有无限性、反复性
③意识具有直接现实性            ④真理时具体的、有条件的

A:①②

B:①④

C:③④

D:②③

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A

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