CO_2是初中化学很重要的化合物,综观近几年各地中考化学试题,CO2知识常考常新。本文就2002年各地中考试题中有关CO2知识在生活、生产、环保和科技中应用的题目,帮同学们进行分析。一、温室效应例1 图1为二氧化碳在自然界的循环示意图。表明二氧化碳对自然界的生命活动及维持 CO_2 is a very important compound in junior high school chemistry. Looking at the chemistry test questions in recent years in various places, the knowledge of CO2 is often taken as Changxin. This article will help the students to analyze the topic of CO2 knowledge in life, production, environmental protection and science and technology in various local examination questions in 2002. First, the greenhouse effect Example 1 Figure 1 shows the carbon dioxide circulation in nature. Shows CO2’s natural life activities and maintenance