单项选择题

Passage Three
Questions 32 to 35 are based on the passage you have just heard.

A．The history of Benjamin Franklin.
B．The history of the U.S. mail.
C．The Changes of writing letters.
D．The history of U. S.

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单项选择题

单项选择题

Passage Three Questions 32 to 35 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。