Barany's theory was proved incorrect______.
A．in zero gravity
B．in cold air
C．in hot air
D．in strong wind

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Who is supposed to be the first to use the parable of Nord’s Net, according to this passage?（）

A．Professor Warren A．Nord.
B．The astronomer Arthur Eddington.
C．Some ancient saga.
D．The author of this passage.

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