单项选择题

If we do not adopt any measures to protect tigers, they will be ______ in the country in near future.

A．distinct
B．extinct
C．separate ,
D．exceptional
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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
______ 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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