单项选择题

The underlined word "perturb" in the first paragraph most probably means ______.

A．modify
B．neglect
C．permeate
D．upset
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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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