what is this ?It is a pen而不是It is pen.但为什么what's this? It's N.就是正确的?N前不能有冠词吗?

what is this?-It is. What is this?It is What is this?It is （）（）. What is this?it is orange. What is this?It is ----------N What is This?it is a______(书) What is this?Is it nice? this is 与 it is有什么区别 还有 what is it 与 what is this look at this!what is this?It is the word what is it 和what is this的区别是什么? 翻译 What letter is this and what color is it? What I__ is this?It's x. What ( )is this It'sv This Is What It Feels Like 歌词 What country is this?It's. This is a book.对book 提问时what is it 对,还是what is this? What is this?是用this isF还是this is a F还是it is F this is a kind of what it is