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.
单项选择题
What can be inferred about the swallows mentioned in the conversation
A．They are a type of insect.
B．They are a kind of fish.
C．They are a type of bird.
D．They are a type of pi
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