单项选择题

Meteorologists forecast the weather______.

A．when they have received satellite pictures
B．during they study satellite pictures
C．after they have compared new satellite pictures with earlier ones

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单项选择题

Why do we use the weather satellites to take pictures of the atmosphere

A．Because clouds form there.
B．Because the weather satellites can do it easily.
C．Because the weather forms there.

单项选择题

Maybe we'll soon be able to forecast the weather for______ .

A．one day
B．seven days or even longer
C．five days