对话阅读。 Alice:Hi,Peter, is this your pencil?
Peter:No.I don't have a pencil.
Alice:Mary,is this your pencil?
Mary:No,it isn't.My pencil is yellow.
Alice:John,is this your pencil?
John:No.Look,this is my pencil.My pencil is blue.
Joe:I can't find(找到)my pencil.It's green.Do you see it,Alice?
Alice:Is this your pencil?
Joe:Yes,it is.Thank you,Alice.