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举一反三
【单选题】Telecommunications allows people around the World to contact one another, to access information instantly, and to communicate from remote areas. Telecommunications usually involves a sender of informa...
A.
Telecommunications are devices and systems that transmit electronic signals across long distances.
B.
Telecommunications allows people around the world to contact one another, to access information instantly, and to communicate from remote areas.
C.
Telecommunications usually involves a sender of information and one or more recipients(收件人) linked by a technology.
D.
Telecommunications are devices and systems that carry, electronic signals across short distances.