单项选择题

The first recorded use of natural gas to light street lamps it was in the town of Frederick, New York, in 1825（）.

A．was
B．is
C．it is
D．were

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单项选择题
The eastern bluebird is considered the most attractive bird native of North America by many bird-watchers（）.

A．native
B．native with
C．native by
D．native to
单项选择题
The ultimate cause of the Civil War was the bombardment of Fort Sumter（）.

A．only
B．final
C．True
D．special
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