近年来,有关“社会热点”的试题经常在中考试卷中出现.这类试题一般具有“高起点、低落点”的特点,有利于考查考生的综合素质.热点一环境保护例1 仔细阅读下文,并回答问题汽车的尾气汽车为人类文明做出了巨大的贡献,同时对自然生态环境的恶化,负有难以推卸的责任.某些城市交通发达,车辆川流不息.行驶的汽车大量排放含有氮氧化物、一氧化碳、碳氢化合物等废气.在强烈的日 In recent years, test questions about “social hotspots” often appear in the Chinese exam papers. These test questions generally have the characteristics of “high starting point, low starting point”, which are conducive to the examination of the overall quality of candidates. Read the following carefully and answer the questions. The exhaust of automobiles has made a tremendous contribution to human civilization. At the same time, it has an irresponsible responsibility for the deterioration of the natural ecological environment. Some cities have developed traffic and vehicles continue to flow. Contains nitrogen oxides, carbon monoxide, hydrocarbons and other exhaust gases. On a strong day