when is your birthday?My birthday is December 17.这样回答正确吗?

问题描述:

when is your birthday?My birthday is December 17.这样回答正确吗?
when is your birthday?这句话的回答应该是My birthday is December 17th.但为什么冀教版七年级上册的书上印的却是My birthday is December 17.是印刷错误吗?

My birthday is December 17th 和 My birthday is December 17都表示同一个意思啊,晕!
序数词表示几号几号时,后面的st,rd或者th可以省略啊!