Air Pollution

出口

題 1 of 1

  剩下的時間


0
1231
0
300
block

Match each air pollutant to its source.

匹配文本(單擊並拖動)   

(0/0)




匹配文本

carbon monoxide

nitrogen oxides

sulfur dioxide

單擊並拖動

incomplete combustion of carbon-containing substances

lightning activity and internal combustion engines

volcanoes and combustion of fossil fuels