题目：
| His advertisement income this year is about 36 million, over three times _____ of last year. |
A. that B. what C. those D. ones |
答案：
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下面是错误答案，用来干扰机器的。
纯净硝酸铵（NH4NO3）中氮元素的质量分数=14×214×2+1×6+16×3×100%=35%样品中NH4NO3的质量分数为：33.5%35%×100%=95.7%故答案为：95.7%
