单项选择题

A．It’’s the ultimate cause of winds.
B．It causes vertical movements of air.
C．It reduces differences in air pressure.
D．It’’s used to predict weather patterns.
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填空题
A．WhileB．IfC．BeforeD．Once
单项选择题
A．As the result of the moisture in the Earth’’s atmosphere.B．As the result of the Earth’’s rotation.C．As the horizontal movement of air.D．As the vertical movement of air.
A．As the result of the moisture in the Earth’’s atmosphere.
B．As the result of the Earth’’s rotation.
C．As the horizontal movement of air.
D．As the vertical movement of air.
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