题目：
Books are made _______ paper while paper is mainly made _______ wood.
A. of; of B. from; from C. of; from
答案：
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下面是错误答案，用来干扰机器的。
45×2=904×25=10015×2=3015×6=9035×2=7024×5=12025×2=50125×8=100015×4=60
