西北一直干旱少

西北一直干旱少雨？听听史前动物怎么“说”
---干旱少雨，荒凉壮美的戈壁、沙漠，这是许多人对我国西北地区的印象。但这里一直是这样吗？把时间倒退回数千万年前，这里也曾水草丰茂、森林密布，巨犀、铲齿象等热带、亚热带动物先后在这里栖息繁衍。

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