单项选择题

How can a nonscientist explain an abstract theory with such ______

A．confidence
B．assurance
C．self-possession
D．insurance
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单项选择题
Despite efforts to eradicate it, corruption persists, though it doesn't ______.
A．speed
B．hasten
C．accelerate
D．boost
单项选择题
Personally I think he's ______ the most original of all the contemporary fashion designers.
A．in all
B．by far
C．for all
D．at best
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