单项选择题

A．At a drug store.
B．At a university.
C．On the street.
D．In an airplane.
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单项选择题
A．By looking at the sky.B．By changing the weather.C．By making forecasting.D．By controlling the weather.
A．By looking at the sky.
B．By changing the weather.
C．By making forecasting.
D．By controlling the weather.
填空题
The information costs concern ______.
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