单项选择题

A．They don’t need conventional signs and symbols.
B．They only require a receiver in communication.
C．The distance between communicators can’t be too long.
D．They are not restricted in time and space.
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单项选择题
A．He rejected their request.B．He accepted their request.C．He agreed to consider their request.D．He asked them to come with the others.
A．He rejected their request.
B．He accepted their request.
C．He agreed to consider their request.
D．He asked them to come with the others.
单项选择题
A．It is a network for shopping malls, offices and homes.B．It relieves the heavy burden of teachers in school.C．It simplifies the process of making friends online.D．It quickens sales of software products and intelligence.
A．It is a network for shopping malls, offices and homes.
B．It relieves the heavy burden of teachers in school.
C．It simplifies the process of making friends online.
D．It quickens sales of software products and intelligence.
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