单项选择题

The title of professor should be given only to those who, first and foremost, do ______.

A．teaching
B．scientific research
C．field work
D．investigation
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单项选择题
What does smart lighting system mean
A．It can be turned off when you don't speak, and be turned on when you speak.
B．It can adjust to the internal clock of human beings.
C．It can develop itself with time goes by.
D．It can respond to human beings' every demand.
单项选择题
With regard to marriage in Britain, present day girls differ from former time girls in______.
A．the right to marry
B．more parental support
C．choosing husbands
D．social position
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