A:钙沸石Ca(Al2Si3O10)·3H2O表示为CaO·Al2O3·3SiO2·3H2O
B:镁橄榄石Mg2SiO4表示为2MgO·3SiO2
C:正长石KAlSi3O8表示为K2O·Al2O3·6SiO2
D:高岭石Al2(Si2O5)(OH)4表示为Al2O3·2SiO2·2H2O
Now there ___ lots of buses.
Nobody can live________ fresh air and clean water.