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單項選擇題

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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單項選擇題

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

單項選擇題

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

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