Whis is this?回答A:This is ruler.B:It is a ruler.

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Whis is this?回答A:This is ruler.B:It is a ruler.
Whis is this?回答A:This is ruler.B:It is a ruler.

Whis is this?回答A:This is ruler.B:It is a ruler.
你看 问题说is 表明问的是一个东西 回答时候说这是一个尺子 介绍名词前 加冠词a

B

B