单项选择题

A．Windows.
B．A specialized software.
C．MS-DOS.
D．Not mentioned.
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单项选择题
A．In April.B．In May.C．In July.D．Not decided yet.
A．In April.
B．In May.
C．In July.
D．Not decided yet.
单项选择题
A．1910.B．1909.C．1966.D．1972.
A．1910.
B．1909.
C．1966.
D．1972.
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