What's this the pencil case Yes ,it is.哪错了

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• 填写恰当的句子补全对话A：What are you doing,Tom?B:I`m looking for my new pen.A:（1)______________________?B:I bought it yesterday .A:(2) ______________________?B:It is red .I like it very much .A :Let me help you .Isit in your bag B:(3) _________________________?A:Did you leave it at home B:(4)_______________.I put it in my penciL case this morning .A :oh!Is that pen under Kate`s chair yours B:Yes,it is.(5)__________________.A:You`re welcome.
• What's this the pencil case Yes ,it is.哪错了
• What's this the pencil case Yes ,it is.哪错了
• a：what is in the --------- of your desk b：a pencil case
• 我有2个问题1,是不是奇函数都会有F（0）=0为什么?2已知函数F（X）对任意的实数X,Y都有F（Y+X）=F（X）+2Y（X+Y）切F（1）=1,求F（X）的解析式我是这样做的F（1+Y）=F（1）+2Y（1+Y）再令1+Y=T.换元 Y=T-1代如上式得 2T平方-2T=1可答案是2X平方-1我错在哪里,代数法我知道，但是为什么不能这样代呢?