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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单项选择题
When do the swallows return to San Juan Capistrano
A．In March.
B．In early summer.
C．In October.
D．In April.
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