请你给格林先生介绍一下学校情况，做一次校园小导游吧!选一选。

A．Is it next to Classroom 4.

B．Where is the teachers' office ?

C．It's next to the library．

Teachers' office	Library	Classroom 4
Classroom 3	Classroom 2	Classroom 1

A: Welcome, Mr. Green!

B:Thank you．?

A: It's on the second floor.

B:    ?

A: No, it isn't．

B: OK. Thanks.