2017年托福考试真题,2017年6月托福考试写作常见语法错误：智慧城市的崛起

　　找出下列句子的一处 语法错误：
　　When smart traffic lights are set up and traffic management softwares are installed, the number of green lights on each street has been optimized to avoid traffic congestion as well as to allow ambulances to reach incidents without any delay.
　　♜ 适用考题：
　　The most important problem affecting our society today will be solved in our lifetime. (2012.10.27)
　　答案：
　　When smart traffic lights are set up and traffic management software is installed, the number of green lights on each street has been optimized to avoid traffic congestion as well as to allow ambulances to reach incidents without any delay.
　　* software (不可数名词)软件;托福写作常用不可数名词，还有：education, transportation, equipment, evidence, globalization, feedback, homework, advice, information等。

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