单项选择题

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

A．computer science
B．telecommunication technology
C．phoning services
D．booking technology
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单项选择题
Which of the following is the best possible title for this essay
A．An Introduction to Desktop Video Conferencing.
B．Modern Office and Video Conferencing.
C．A New Solution for Office Work.
D．Face to Face with Your Partners.
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