单项选择题

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

A．Social challenge.
B．Physical challenge.
C．Economic challenge.
D．Intellectual challenge.

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单项选择题

单项选择题

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