“逐步逼近法”可加快解题速度,解答选择题程序设计图如下:一、一步逼近——审题。阅读试题应紧紧抓住试题中关键性的词语。如“最”、“是”、“不是”、“能”“不能”,“正确的”、“不正确的”、“可以”、“不可以”、“有错误的”等。实践表明,有的考生在紧张之余,常常习惯于选择错误的答案,而有时却与试题的要求恰恰相反,在走出考场之后,他们才痛悔粗心大意。有的考生则对“最”字重视不够,在选择了一个正确答案后,又从“似真性”答案中选择第二个、造成了“画蛇添足”。所以,通过审题,可以初步断定答案数目,而对于属于“识记”、“理解”、“应用”等一类简单答案,就可立即作出选择。例1 硝酸的酸酐是( ) (A) “Step-by-step approach” can accelerate the speed of problem solving, and the multiple-choice program design diagram is as follows: First, step-by-step approach - question review. Reading test questions should firmly grasp the key words in the questions. Such as “most”, “is”, “is not”, “can” “can not”, “correct”, “incorrect”, “can”, “not”, “wrong” and so on. Practice has shown that some candidates are often accustomed to choosing the wrong answers when they are nervous, and sometimes they are contrary to the requirements of the questions. After they walked out of the examination room, they were guilty of carelessness. Some candidates did not pay enough attention to the word “most”. After choosing a correct answer, they chose the second one from the “likeliness” answer, resulting in “adding a superfluity.” Therefore, by examining questions, the number of answers can be preliminarily determined, and for simple answers such as “remember”, “understand”, and “apply”, immediate choices can be made. Example 1 The acid anhydride of nitric acid is () (A)