单项选择题

How did people in the early Ice Age keep warm

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 sout
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单项选择题
What did the man think about the people of the Ice Age
A．They lived in caves.
B．They traveled in groups.
C．They had an advanced language.
D．They ate mostly fruit.
单项选择题
What did the professor want to talk to Ann about
A．A vacation trip to Yellowstone Park.
B．A lecture by a visiting professor.
C．Her biology thesis.
D．A research project.
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