单项选择题

According to the author, the breakthrough of this technology starts from ______.

A．computer science
B．telecommunication technology
C．phoning services
D．booking technology
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单项选择题
From the passage, we can safely infer that ______.
A．the use of video conferencing is still a mystery for the general public
B．video conferencing may be as simple as telephones for communication
C．face to face relationship is important for customers and suppliers
D．video conferencing is especially popular with information technology firms
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