单项选择题

Working in the library is not his only ______.

A．profession
B．employment
C．prohibition
D．custom
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单项选择题
Some crystals emit visible light when ______ by ionizing particles.
A．burned
B．struck
C．excited
D．inspired
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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