单项选择题
Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.
A.spring，around late evening
B.spring，around early evening
C.fall，around early morning
D.fall，around midday
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单项选择题
Radiation fog（）.
A.always forms over water
B.is formed by a temperature inversion
C.is thinnest at the surface
D.dissipates during the evening -
单项选择题
On the pole side of the trade wind belt，there is an area of high pressure with weak pressure gradients and light，variable winds. This area is called the（）.
A.prevailing westerlies
B.geostrophic winds
C.doldrums
D.horse latitudes -
单项选择题
Ocean currents are well defined and（）.
A.create large waves in the direction of the current
B.change direction 360°during a 24 hour period
C.remain fairly constant in direction and velocity throughout the year
D.are characterized by a light green color
