单项选择题


Questions 19 to 22 are based on the passage you have just heard.
What is the ovenbird’s nest made of

A．Branches.
B．Mud.
C．Grasses.
D．Straw.
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单项选择题
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.
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.
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