A．South AmericaB．The countryside throughout America.C．U-找考题网

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A．South America
B．The countryside throughout America.
C．Urban areas in the southern U.S.A.
D．The countryside in the Southern U.S.A.

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A．To send more spacecraft.B．To receive radio signals.C．To use modem telescopes.D．To welcome men From outer space.

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