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信息发布者:
A: What's in the classroom?
B: There are many desks and chairs.
 There are some balls on the shelf. There's a big blackboard on the wall.
A: Is there a teacher's 
desk in the classroom?
B: Yes, there is. It's in 
front of the blackboard.
A: Are there any books in the classroom?
B: Yes, there are. There are some books on the desks.