this dictionary is ideal -it"s exctly what l needed.为什么是what

what's this?的回答为什么是it's… 为什么不用this is…回答 what is this ?It is a pen而不是It is pen.但为什么what's this? It's What is this?It is S.为什么回答不是 It is a S. It's(an orange)提问是What is this? What's this color?=------- --------is it? What country is this?It's. What is this It's a_ What ( )is this It's"v" What is that in English?It's a dictionary,a dictionary?英语轻负 what is this?可以写成 what's this?为什么? 英语翻译为什么答案选what color is it 不选 what's this what撇s is it 还是what is it 为什么