单项选择题
Advection fog is most commonly caused by（）.
A.air being warmed above the dew point B.saturation of cold air by rain C.a rapid cooling of the air near the surface of the Earth at night D.warm moist air being blown over a colder surface
单项选择题 Advection fog holds longest over which portions of the lakes? （）
单项选择题 According to Buys Ballot’s law，when an observer in the Northern Hemisphere experiences a northwest wind，the center of low pressure is located to the（）.
单项选择题 A warm air mass is characterized by（）.
