单项选择题


Questions 19 to 22 are based on the passage you have just heard.
Why is there a hole in the weaverbird’s nest

A．To let in the sunshine.
B．To serve as its door.
C．To keep the nest cool.
D．For the bird to lay eggs.
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单项选择题
How long does the training period last
A．Two to four months.
B．About three weeks.
C．At least half a year.
D．Two years or more.
单项选择题
Why did the window get its name
A．Because it kept out the wind.
B．Because it blew out the smoke.
C．Because it let in more wind than light.
D．Because it let in most light.
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