单项选择题

A．Planting crops.
B．Building houses.
C．Clearing new land.
D．Caring for animals.
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单项选择题
A．The room is on fire.B．The men are bothered by the smoke.C．There is very little breeze.D．The men are not permitted in the room.
A．The room is on fire.
B．The men are bothered by the smoke.
C．There is very little breeze.
D．The men are not permitted in the room.
单项选择题
A．They were imported from European countries.B．They migrated from distant colonies.C．They were domesticated from local wild breeds.D．They were the result of a careful breeding program.
A．They were imported from European countries.
B．They migrated from distant colonies.
C．They were domesticated from local wild breeds.
D．They were the result of a careful breeding program.
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