新近有些简答题,题干中提供了某些学生从未接触过的新材料,或是学生司空见惯的知识,但却寓有未能想到过的新意。要求学生运用学过的知识,解释题干提供的有关事实。为讨论方便暂且将这类简答题称为“解释型”习题。例如：“用金属rrrrrrrrrn钠制取氧化钠通常采用下面方法，2NaNO＋6Na＝4Na-2o＋ N。个，试解释为什么不用钠在氧气中燃烧而用此法制取Na-O的原因。” There are some short answer questions recently. The new materials that students have never contacted are provided in the questions, or the students are familiar with the new knowledge but they have new ideas that they could not think of. Students are required to use the knowledge they have learned to explain the facts provided by the questions. For the convenience of discussion, such short answer questions will be referred to as “interpretative” exercises for the time being. For example: “Sodium production from sodium metal is usually done using the following method, 2NaNO+6Na=4Na-2o+N. This will explain why sodium is not used. The reason why Na-O is produced by this method of burning in oxygen."