单项选择题

Passage One Questions 26 to 29 are based on the passage you have just heard.

A．Three thousand years ago.
B．When man began to salt fish.
C．When man began to preserve the dead.
D．No one knows.

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单项选择题

单项选择题

Passage One Questions 26 to 29 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。