单项选择题

How far do the swallows migrate

A．About 200 miles.
B．About 1, 000 miles.
C．About 7,000 miles.
D．About 5,000 miles.

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问答题

A．From chasing an animal.B．From rolling a body of a heavy animal on logs.C．From watching a rolling stone.D．From watching running animals.

问答题

A．Small area, small population.B．Small area, large population.C．Large area, small population.D．Large area, large population.

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