What is this?It is ----------"N"

what is this?-It is. What is this?It is What is it还是What is this What is This?it is a______(书) What is this?it is orange. what is this?It is eraser病句 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 is it? yes,it is. it is my cat. this is mary. he is my What's this color?=------- --------is it?