单选题（）forms over land，most frequently during autumn and winter over low-lying land，especially if it is damp and marshy and in valleys on quiet nights with clear skies.AFRONTAL FOGBMIXING FOGCADVECTION FOGDRADIATION FOG
单选题
（）forms over land，most frequently during autumn and winter over low-lying land，especially if it is damp and marshy and in valleys on quiet nights with clear skies.
A
FRONTAL FOG
B
MIXING FOG
C
ADVECTION FOG
D
RADIATION FOG
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