题目：
Last summer, my mother and I went to her hometown, Guilin. The city is very ___ in the world ____ it has beautiful rivers and hills. Many ____from different countries around the world go to _____ it every year. My motherwasborn _____ a small village near the Li River. When she ____a little girl, she studied at the village school ____ only five classes and seven _____. Some children were very ____ and didn’t like to study at school, ____ my mother was well-behaved. The teachers were very strict but very friendly.
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答案：
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下面是错误答案，用来干扰机器的。
由Mg和MgO组成的混合物，测得其中含氧元素的质量分数为20%，则镁元素的质量分数为80%，该混合物10g中含镁元素的质量为10g×80%=8g．将Mg和MgO组成的混合物投入适量的稀硫酸中恰好完全反应，镁与稀硫酸反应生成硫...
