我们认为:所谓问题化学习就是通过问题来建构自主学习过程的活动。它要求学习活动以问题的发现与提出为开端,用问题主线来贯穿学习过程和整合各种知识,并把对问题的思考、解决、感悟,作为对学习目标的追求与对学习结果的检验。我们提出了“解决老问题——解决新问题——解决疑 In our opinion, the so-called problem-based learning is the activity of constructing autonomous learning process through questions. It requires that learning activities begin with the discovery and presentation of problems, use the problem mainline to penetrate the learning process and integrate all kinds of knowledge, and take the thinking, solving and perceiving of problems as the pursuit of learning objectives and the test of learning outcomes. We have proposed "to solve the old problem - to solve the new problem - to solve the doubt