单项选择题

A．electric
B．electrical
C．electronic
D．electronics
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单项选择题
A．HoweverB．ThereforeC．FurthermoreD．Otherwise
A．However
B．Therefore
C．Furthermore
D．Otherwise
单项选择题
A．known ofB．known asC．knowing asD．known
A．known of
B．known as
C．knowing as
D．known
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