单项选择题

A．Growth of violence on TV.
B．Destructive threat from nuclear explosives.
C．Decreasing of moral standards.
D．All of the above.
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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
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