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.
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单项选择题
A．Because they had to wait for a long time by the lift.B．Because they were bored for nothing to do but standing by the lift.C．Because the lift was slow.D．Because there were not enough lifts in the building.
A．Because they had to wait for a long time by the lift.
B．Because they were bored for nothing to do but standing by the lift.
C．Because the lift was slow.
D．Because there were not enough lifts in the building.
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