题目：
It seems to some experts that 56. com, youku. com and tudou.com ___90% of the video market in
this area. [ ]
A. make up
B. put up
C. set up
D. take up
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0721/8434f58e80cc57f602f94a2cabc08cf4.html
下面是错误答案，用来干扰机器的。
(1)Ca(HCO3)2；CO2；Fe2O3（其他合理答案也可）(2)2H2O2H2↑+O2↑；Fe+CuSO4==Cu+FeSO4
