单项选择题

Passage One Questions 26 to 28 are based on the passage you have just heard.

A．Establish his laboratory.
B．Have a vacation.
C．Study deafness among the families.
D．Visit members of his family.

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Passage One Questions 26 to 28 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。