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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单项选择题
A．She hasn’t prepared the course outline yet.B．She’ll distribute the course outline during the next class.C．There aren’t any copies of the course outline left.D．The man can get the course outline after class.
A．She hasn’t prepared the course outline yet.
B．She’ll distribute the course outline during the next class.
C．There aren’t any copies of the course outline left.
D．The man can get the course outline after class.
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