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选择题是我国高等学校入学考试中经常采用的一种题型,它一般是由题干和备选答案(或称选项)两部分组成。在近几年的化学高考中,选项一般设4或5个,其中包括1或2个正确答案。很明显,供选择的备选答案数不同、正确答案数不同,各题的难易程度也有所不同。比如,从四个备选答案中选择二个正确答案的题要比四中选一题,凭经验判定要难些;同样,五中选一题要比四中选一题难些。上述不同类型的选择题,其难易程度上的差异能否定量化,
The multiple-choice question is a type of question often used in entrance examinations in institutions of higher learning in our country. It is generally composed of two parts: a question title and alternative answers (or options). In the chemical college entrance examination in recent years, options are generally set to 4 or 5, including 1 or 2 correct answers. Obviously, the number of alternative answers available for selection is different, the number of correct answers is different, and the degree of difficulty of each question is also different. For example, if you choose two correct answers from four alternative answers, you have to choose one by one. It is more difficult to judge by experience. Similarly, it is more difficult to select one question than to select one. The differences in the degree of difficulty between the different types of multiple-choice questions mentioned above can be negatively quantified.