单项选择题

A．An advertisement.
B．An address.
C．An operator.
D．Long distance rates.
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单项选择题
The reactive speed plays a rather important role in the usability of web browsers.
A．Y
B．N
C．NG
单项选择题
A．He has got a bad cold.B．He has caught whooping cough.C．He has a fever and a bad appetite.D．He has been coughing for several days.
A．He has got a bad cold.
B．He has caught whooping cough.
C．He has a fever and a bad appetite.
D．He has been coughing for several days.
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