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．Teacher and studentB．SistersC．Good friendsD．Mother and daughter
A．Teacher and student
B．Sisters
C．Good friends
D．Mother and daughter
单项选择题
A．To improve the diets of hensB．To move chickens into large farmsC．To make chickens sleep before they are killedD．To improve chickens’ lives
A．To improve the diets of hens
B．To move chickens into large farms
C．To make chickens sleep before they are killed
D．To improve chickens’ lives
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