是“a boy or girl"还是“a boy or a girl"

是“a boy or girl"还是“a boy or a girl" Is () a boy or girl Is___ a boy or girl? is it a boy or a girl Are you a boy or a girl is -- a boy or a girl God is a girl or boy? ____ your friend a boy or a girl?空格是填is还是填are?为什么? Is your pen pal a boy or a girl? is this a boy or a girl改复数句 is your friend a boy or a girl? Is Gao Fang a boy or a girl?