To make 1 ton of paper, how many trees have to cut?
To make 1 ton of paper, how many trees have to cut?
A) 15 trees
B) 17 trees
C) 20 trees
D) 25 trees
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To make 1 ton of paper, how many trees have to cut?
A) 15 trees
B) 17 trees
C) 20 trees
D) 25 trees