9、Flying Disks were invented          .

A．on the 1950s.          B．in the 1950s.    C．in 1950s.         D．a(chǎn)t twentieth century

9、B

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Flying Disks were invented          .

A．on the 1950s.          B．in the 1950s.    C．in 1950s.         D．a(chǎn)t twentieth century

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