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
It is irenic that a man with such a decent dress and graceful manner be a gangster.
A．can
B．may
C．should
D．would
单项选择题
Many automobile accidents were ______ careless driving.
A．attributed to
B．resulted in
C．contributed to
D．raised from
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