问题描述：
in the picture,you can see some desks__3_chairs._4_th blackboard,you can see two black and white.
3.A.or B.but C.and D.there
4.A.in B.of C.at D.on
3.A.or B.but C.and D.there
4.A.in B.of C.at D.on
问题解答：
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