单项选择题
Fog is most commonly associated with a(n)（）.
A.warm front at night B.low pressure area C.anticyclone D.lack of frontal activity
单项选择题 Charted depths are decreased（）2 meters．
单项选择题 Charted depths（）by 2 meters due to state of the winds．
单项选择题 Charted depth is the（）.
