The most important sources请帮忙翻译下The most important sources of air pollution in China are the emissions of( ).1.plane 2.motorcycles.3.Auto 4.industrial emissions

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The most important sources请帮忙翻译下
The most important sources of air pollution in China are the emissions of( ).
1.plane 2.motorcycles.3.Auto 4.industrial emissions

中国最重要的空气污染来源是什么的排放
1、飞机2、摩托车3、汽车4、工业排放
3或4?