恐龍. 內容大綱. 一 . 恐龍的出現 二 . 恐龍的種類 三 . 恐龍的起源. 恐龍的出現. 恐龍地出現 距今六千五百萬年前，一顆巨大的隕石曾撞擊地球，使得君臨地球長達一億數千萬年的恐龍絕種. 恐龍的種類.
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