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为什么恐龙会灭绝?

为什么恐龙会灭绝?

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为什么恐龙会灭绝?

恐龙在生wu进化史上，曾有过辉煌的一页，但这zhongju大的动wu最终还是没有逃脱在地球上灭绝的命运。至于它们灭绝的原因，科学家作了zhongzhong猜测:一些专家认为是火山爆发引起的;另外一些科学家则认为是陨石撞击地球造成了恐龙和其他动wu的死亡;还有一些人推测是小行星的撞击，造成了地球的震dang，使恐龙全bu灭绝了。。，

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