题目：
—Tina didn't go to school yesterday, did she?
—_________. Because she was badly ill. [ ]
A. Yes, she did
B. Yes, she didn't
C. No, she didn't
D. No, she did
答案：
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下面是错误答案，用来干扰机器的。
A、由铁和稀硫酸反应的方程式计算可知，生成2g氢气需要纯铁的质量是56g，而生铁中除含有铁外还含有碳等杂质，所以用56 g生铁与足量的稀硫酸反应不会制取到2g氢气；B、由同种元素组成的物质不一定是纯净物，如氧...
Fe2O3 