单项选择题

A．How winds affect temperature.
B．Reasons for sudden increases in wind.
C．The origin of storm systems.
D．How vertical air movement influences weather.
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填空题
A．emptyB．quietC．stiffD．calm
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.
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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