a human being 一般用代词 it 还是 he or she 指代 ?

a human being 一般用代词 it 还是 he or she 指代 ? 当human being表示人类时 用human being造句 a human being a human kind可以加,A puma will not attack a human being unless it is conered 其中being在这里是什么意思,为什么用being human being 后面用are还是is human呢? human being还是human beings? How do a human being's lungs work? of all living creatures, why a human being? 歌词 human being right? human being英语翻译 human being !是什么意思? human being怎么读 each human being用单数还是复数(is/are)? human being和human加的谓语用单数还是复数? human和human being有什么区别? human beings与human being的区别 people和human,human being的区别 with the development of science,human being livesin a virtual world,这句话里面有错的吗?特别是human being这里应该是单数还是,而且后面的live应该用单数还是?