单项选择题

A．Indifferent.
B．Hospitable.
C．Unkind.
D．Quick-tempered.
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单项选择题
A．Because the old one could not transfer signals clearly.B．Because the old one could only send two messages along the same line simultaneously.C．Because the old one could not send messages quickly enough.D．Because the old one could not send more than one message at the same time.
A．Because the old one could not transfer signals clearly.
B．Because the old one could only send two messages along the same line simultaneously.
C．Because the old one could not send messages quickly enough.
D．Because the old one could not send more than one message at the same time.
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