{:( , " column A" ,,,"column B"),( A., SO_(3) ,( ),a.," green houseeffect"),(B. ,O_(3) ,( ),b. ," Carbonicacid "),( C.,CO_(2) ,( ),c., "Artificalbreathing "),(D., N_(2)O+O_(2) , ( ) , d. , "Acid rain "),( E., 95% + 5%CO_(2) , ( ) ,e.,"Anesthetic "),(F.,O_(2)+H_(2) , ( ), f., " stratosphere"),( G.,H_(2) O+CO_(2), ( ) , g., " Welding "):}

{:( , " column A" ,,,"column B"),( A., SO_(3) ,( ),a.," green houseeff

1.	{:( , " column A" ,,,"column B"),( A., SO_(3) ,( ),a.," green houseeffect"),(B. ,O_(3) ,( ),b. ," Carbonicacid "),( C.,CO_(2) ,( ),c., "Artificalbreathing "),(D., N_(2)O+O_(2) , ( ) , d. , "Acid rain "),( E., 95% + 5%CO_(2) , ( ) ,e.,"Anesthetic "),(F.,O_(2)+H_(2) , ( ), f., " stratosphere"),( G.,H_(2) O+CO_(2), ( ) , g., " Welding "):}
Answer» Solution :`{:(A:d),(B:f),(C:a),(D:E),(E:c),(F:G),(G:b):}`