单项选择题

Scientists learned about the barred owl migration by ______.

A．decoding spotted owl sounds
B．feeding mice to the owls
C．monitoring spotted owl populations
D．researching the Internet
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单项选择题
Ned Brown is a professor at ______.
A．UC Berkeley
B．UCLA
C．UC Davis
D．University of Washington
单项选择题
When Stan Sovern calls the spotted owl, ()

A．a mouse appears
B．the spotted owl ignores him
C．no one answers
D．barred owls appear
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