单项选择题

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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单项选择题
A．$1200B．$2400C．$1500D．$4200
A．$1200
B．$2400
C．$1500
D．$4200
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.
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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