单项选择题

The information superhighway came into existence because of ______.

A．copper wire cables
B．satellite communication
C．optical fibers
D．laser and optical fibers
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单项选择题
The highly efficient modem communication system began ______.
A．over a century ago
B．in the middle 1960s
C．in the late 1980s
D．in the year 1980
单项选择题
What does brainchild in the paragrapth 4 mean
A．Patent.
B．Invention.
C．Hope.
D．Pride.
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