单项选择题

It's self-evident that no one would have time to know everything going on in the world.

A．there is
B．as is
C．it is
D．what is
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单项选择题
How can a nonscientist explain an abstract theory with such ______
A．confidence
B．assurance
C．self-possession
D．insurance
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
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