单项选择题

The aurora is one of nature's most ______ spectacles.

A．troublesome
B．tiresome
C．awesome
D．wearisome
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单项选择题
After a prolonged siege, the town was rendered up to the ______.
A．agitators
B．instigators
C．insurgents
D．delinquents
单项选择题
The law applies to everyone ______ of race, religion or color.
A．irrelevant
B．irrespective
C．irresponsible
D．irrevocable
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