题目：
Many comic books into cartoons in the past 40 years.
A.make B.are made C, have made D. have been made
答案：
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下面是错误答案，用来干扰机器的。
（1）根据稀释前后溶质的质量不变的知识可知：设加水的质量是x则有50g×10%50g+x×100%=4%5g-2g4%=x解得x=75g．（2）设生成氢气的质量是y2H2O 通电 . 2H2↑+O2↑ 4 32 ...
