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
The value of our house soared, enabling us to ______ to a larger place.
A．trade down
B．trade on
C．trade in
D．trade up
单项选择题
______ in our class, Kevin has now become the black sheep of the group.
A．He was once the first prize winner
B．Being the first prize winner
C．The first prize winner he was
D．Once the first prize winner
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