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单项选择题

Satellites travel______.

A．in space
B．in the atmosphere
C．above the ground

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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

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.