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1992年中考有这样一道选择题:“将混有少量氧化铜粉末的铁粉加入到盛稀硫酸的烧坏中,充分反应后有部分铁剩余。过滤,滤液中含有的溶质是(A)有H_2SO_4(B)有H_2SO_4和FeSO_4(C)有CuSO_4和Fe-SO_4(D)只有FeSO_4”这是一道综合性较强的推断题。我们发现相当一部分学生在解这类题时,往往由于审题不清,或不能透彻理解题意,且对问题缺乏综合分析,而导致错误率较高。
In the 1992 mid-term exam, there was a multiple-choice question: "Add iron powder mixed with a small amount of copper oxide powder to the burnt of sulfuric acid, and after sufficient reaction, some iron remains. Filtrate, the filtrate contains solute (A). H_2SO_4(B) has H_2SO_4 and FeSO_4(C) has CuSO_4 and Fe-SO_4(D) has FeSO_4 only. This is a comprehensively deduced question. We have found that a considerable number of students are often guilty of misunderstanding, or lack of thorough understanding of the meaning of the questions, and lack of a comprehensive analysis of the issues, resulting in a higher error rate.