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
The future ______ of the bald eagle is still an important American ecological concern.
A．birth
B．evolution
C．migration
D．survival
单项选择题
______ all the members of the commission present here who are here tonight, I would like to thank Professor Clinton for his informative talk.
A．On behalf of
B．On account of
C．In honor of
D．In terms of
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