What is the author's feeling towards the disappearance of Af

What is the author's feeling towards the disappearance of African languages?A. d

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根据耶克斯—多德森定律,动机水平与学习效果之间的关系呈_________曲线。

根据耶克斯—多德森定律,动机水平与学习效果之间的关系呈_________曲线。

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