单选题Air circulation is caused or affected by（）.Athe rotation of the earth on its axisBconvection currents caused by differences in radiant heating between equatorial and polar regionsCmountain rangesDAll of the above
单选题
Air circulation is caused or affected by（）.
A
the rotation of the earth on its axis
B
convection currents caused by differences in radiant heating between equatorial and polar regions
C
mountain ranges
D
All of the above
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