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
Logging was greatly reduced（）

A．in the northeastern United States
B．on seven million acres of public land
C．two decades ago
D．to save the barred owls
单项选择题
Barred owls like to live in（）

A．The northeastern United States
B．Canada
C．Deep, dense woods of Washington
D．Warm climates
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