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亂石階上,A噠噠向前狂奔,三步并一步三階當(dāng)兩階。 B跟在后面喊:“慢點(diǎn)慢點(diǎn)你慢點(diǎn)!石頭滑,小心摔倒!” A說:“沒事沒事,這有什么!你快著點(diǎn)我趕...