nowadays the overuse of cars is one of the main causes of air pollution这篇文章
问题描述：
nowadays the overuse of cars is one of the main causes of air pollution这篇文章
这篇文章的后面
答
In many big citiesin the world,the overuse of cars is thought to be one of the major causes ofair pollution.What will cars be 192inthe future?Someexperts(专家) think that today'scars are in trouble be...