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目前,国内外许多重大考试采用选择题的形式。常见的选择题所给出的指令性语言是(以83年、84年高校招生数学试题为例):“每一个小题都给出代号为A、B、C、D的四个结论,其中只有一个结论是正确的,把正确结论的代号写在题后的圆括号内。”这种选择题提供选择的答案有且只有一个是正确的,我们称之为一重选择题。上述A、B、C、D四个结论叫做选择题的选择分支。对于一重选择题,以四个选择分支为例,学生猜对的概率为1/4。如果一重选择题有K个选择分支,则猜对的概率为1/K。为了减少猜对的可能性,我们可以增加K的数量,但这将给命题带来困难。一道好的选择题所给
At present, many major examinations at home and abroad take the form of multiple choice questions. The common choices are given in the mandatory language (with 83 years, 84 years of college enrollment math test questions as an example): “Each of the small questions are given four conclusions code-named A, B, C, D Only one conclusion is correct, the correct conclusion of the code written in parentheses after the question. ”This choice to provide answers to the choice and only one is correct, we call a multiple choice. The above four conclusions of A, B, C, D are called the alternative branches of the multiple-choice questions. For a multiple choice question, taking the four alternative branches as an example, the probability of the student guessing is 1/4. If a multiple choice has K alternatives, the probability of guessing is 1 / K. In order to reduce the possibility of guesses, we can increase the number of K, but this will make the proposition difficult. A good choice is given