be known as,这个叫做.举例:This drink is known as Chinese green tea.这种饮料叫做中国绿茶.
be famous as,说法有误,应该是be famous of,以.著称.举例：Chinese tea is famous of it's light refreshing taste.中国茶以清香著称.不好意思，我想你的是错的，书里讲的就是这样，没有误famous as 作为什么而出名

选择题的话要看具体语义，整个句子都要发上来才好，不然无法知道应该填哪一个