单项选择题

Questions 19 to 22 are based on the passage you have just heard.

A．They lived in large groups.
B．They used sand as insulation.
C．They kept fires burning constantly.
D．They faced their homes toward the south.

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单项选择题

单项选择题

Questions 19 to 22 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。