单项选择题

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

A．He should send the package third class.
B．He should send the package first class.
C．He can save his money.
D．The first class mail is expensive.

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单项选择题

单项选择题

Questions 11 to 18 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。