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 modern 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
The first two paragraphs tell us a true story of ______.
A．international cooperation via the Internet
B．how dangerous thallium can be to humans
C．how one can get help from the Internet
D．the girl's recovery from thallium poisoning
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