单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．50%.
B．20%.
C．30%.
D．All of it.
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填空题
For a full refund, the Optima antenna must be returned within ______ after purchase.
单项选择题
A．Earn more money.B．Open another bank account for saving.C．Open another bank account for spending.D．Find a better job.
A．Earn more money.
B．Open another bank account for saving.
C．Open another bank account for spending.
D．Find a better job.
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