单项选择题

A．In 1977.
B．In the early 1980s.
C．In 1980.
D．In 1985.
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单项选择题
A．The Altair.B．The BASIC.C．IBM PC.D．The Apple Macintosh.
A．The Altair.
B．The BASIC.
C．IBM PC.
D．The Apple Macintosh.
单项选择题
A．At the age of 20.B．By the age of 12.C．When he was at high school.D．When he studied in Harvard University.
A．At the age of 20.
B．By the age of 12.
C．When he was at high school.
D．When he studied in Harvard University.
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