{{i}}quEstions 17-20 ArE BAsED on thE Following pAssAgE. you now hAvE 20 sEConDs to rEAD thE quEstions 17-20.{{/i}} how is An ArtiFiCiAl Fog mADE in thE moviEs
A、By pAssing stEAm ovEr Dry iCE.
B、By turning orDinAry iCE into stEAm.
C．By mElting Dry iCE.
D．By mixing Dry iCE with orDinAry iCE.