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

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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
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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
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Low pressure disturbances，which travel along the intertropical convergence zone，are called（）.

A.permanent waves
B.tidal waves
C.tropical waves
D.tropical storms