30. What does Laird Gogins admit about his invention?
A. He believes that the wildmill is more practical than his machine.
B. He believes that a network of his machines would be incapable of
transferring electricity from one place to another.
C. He believes that his machine will probably never be the only device
used to produce power in the United States.
D. He believes that his machine will never be popular outside the United States.
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