A. Elephants can be graceful. B. Tigers are too dangerous to be trained. C. Animals which are natural enemies can be trained to live together. D. Animals can become interested in their tricks. 参考答案:B 答案解析:[关键词语] graceful,live together,interested [详细解答] 根据文章提供的信息可知大型动物(包括狮、虎、象等)受训后也能以优雅的动作进行表演,而本为天敌的动物