经过高温高压，石墨可形成金刚石；不用力拍打，球无法弹得更高。

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经过高温高压，石墨可形成金刚石；不用力拍打，球无法弹得更高。这些现象启示我们（）

A．学习中的压力总给人带来积极的影响

B．没有学习压力，会使生活非常轻松

C．适度的学习压力可在一定条件下转化为动力

D．消除学习压力，才能获得身心健康

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