单项选择题

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
A．Ask Dr. Smith to alter his decision.B．Ask Dr. Smith to call the library.C．Get the book directly from Dr. Smith.D．Get Dr. Smith’s written permission.
A．Ask Dr. Smith to alter his decision.
B．Ask Dr. Smith to call the library.
C．Get the book directly from Dr. Smith.
D．Get Dr. Smith’s written permission.
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