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 beforehand

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单项选择题

39（）

A．of
B．for
C．by

单项选择题

To connect 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

You can minimize the cost if you （）. 您的浏览器不支持 audio 元素。

You can minimize the cost if you （）.