单项选择题

Questions 13 to 15 are based on the conversation you have just heard.

A．One dollar.
B．30 cents.
C．60 cents.
D．90 cents.

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单项选择题

单项选择题

Questions 13 to 15 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。