单项选择题

You can minimize the cost if you

A．update the materials and facilities on the date of change.
B．update the materials and facilities within one year.
C．update your materials and facilities beforehan
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To be connected automatically to your old number, overseas callers will
A．not be charged for the service during the first year.
B．not be charged for the service for the first 9 months.
C．be charged for the service for the first 9 months.
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