大学英语四、六级考试经历了一个不断完善的过程。为提高考试的效度和信度 ,近年来采取了一系列的改革措施。其中 ,80年代中期兴起的机助自适应测验就是一种较好的办法 ,它解决了主动适应考生状况的“因人施测”问题 ,建立了深刻地、综合地反映考生作答反应与题目质量及能力水 College English CET and CET have undergone a continuous improvement process. In order to improve the validity and reliability of the examination, a series of reform measures have been taken in recent years. Among them, the machine-assisted self-adaptive test that emerged in the mid-1980s is a better way. It solves the problem of “measure by reason of person” that takes the initiative to adapt to the condition of the examinee and establishes a profound and comprehensive reflection of the reaction and the quality of the question And ability to water