单项选择题

______ will be given to the doctoral candidates who are registered in their last year of study and who are attending a major professional meeting.

A．Promotion
B．Preference
C．Precaution
D．Priority
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单项选择题
Working in the library is not his only ______.
A．profession
B．employment
C．prohibition
D．custom
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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