单项选择题

Some crystals emit visible light when ______ by ionizing particles.

A．burned
B．struck
C．excited
D．inspired
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单项选择题
It is not uncommon in this country that the military court officers ______ the prisoners cruelly to obtain information.
A．torture
B．shock
C．thrill
D．terrify
单项选择题
The future ______ of the bald eagle is still an important American ecological concern.
A．birth
B．evolution
C．migration
D．survival
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