《理科爱好者》９８年第１９期，笔者撰文“重视基础化难为易———再谈选择题的解法”，文中着重谈基础知识在选择题解法中的运用．本文着重谈用估计法解选择题．通过对问题的仔细而深入地观察———包括认真审读题意并从题干和选择支中获取和挖掘出有用的信息，再对相关的数 “Science enthusiasts,” No. 98 of 19, the author of the article “emphasis on basic difficult is easy to talk about alternative solutions”, the article focuses on the basic knowledge in the choice of solution method. This article focuses on the use of estimation method to solve multiple choice questions. Through careful and in-depth observation of the problem - including careful examination of the questions and answers from the stem and selection of useful information and dig out, and then the relevant number