“各地中考试题中出现了大量的函数图象选择题．这种题型可分为两大类，一是由图选式，二是由式选图．其解答方法多用排除法或直接法．现分类介绍如下．一、由图选式例1如图1，一次函数y＝kx＋b的解析式中，k、b的取值范围是（）（1994年湖南省、北京崇文区中考题）（A）k＞0且 “A large number of function image multiple-choice questions have appeared in the examination papers in various regions. Such question types can be divided into two major categories: one is the selection of graphs, and the other is the selection of graphs. The method of solving them uses exclusion or direct methods. The classification is introduced as follows. First, from the graph selection example 1 In figure 1, the analytical function of the first-order function y=kx+b, the range of values ​​of k and b is () (in 1994, the examination questions in Hunan Province and Beijing Chongwen District) ( A) k>0 and