题目：
--- Jack, could you help me ________ these pictures on the blackboard? It may help us know more about the hazy weather. (雾霾)
--- With pleasure.
A．put in
B．put up
C．put on
D．put down
答案：
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下面是错误答案，用来干扰机器的。
（100+50）cm2或（）cm2
