填空题

S5

【参考答案】

had改成have。
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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.
填空题
S4
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