单项选择题

A．Mr. Smith will be replaced if he makes another mistake.
B．Mr. Smith is an admirable chief of the Asian Department.
C．Mr. Smith’’s department is more successful than all the others.
D．Mr. Smith is seldom in his office.
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单项选择题
The passage is mainly about ______.
A．the latest developments in computer technology
B．public attitude towards the use of e-mail and v-mail
C．the criteria for determining public preference to e-mail or v-mail
D．the advantages of e-mail over v-mail as a means of communication
问答题
Professor Smith succeeded in_______________________________．(通过将其类比成水的运动来解释光的运动)
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