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
Difficulties and hardships have ______ the best qualities of the young geologist.
A．brought about
B．brought forth
C．brought out
D．brought up
单项选择题
After a prolonged siege, the town was rendered up to the ______.
A．agitators
B．instigators
C．insurgents
D．delinquents
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