单项选择题

After years of strenuous work, the scientists are on the __________.of a great discovery of human gene.

A．domain
B．premise
C．threshold
D．pretext
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单项选择题
To realize his childhood dream is the __________ for his consistent efforts.
A．impulse
B．tempo
C．dart
D．impetus
单项选择题
His honesty in financial practice was greatly ______ by his clients.
A．enlightened
B．applauded
C．elevated
D．hoisted
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