单项选择题

Whoever formulated the theory of the origin of the universe, it is just ______ and needs proving.

A．spontaneous
B．hypothetical
C．intuitive
D．empirical
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单项选择题
The introduction of gunpowder gradually made the bow and arrow ______ , particularly in Western Europe.
A．obscure
B．obsolete
C．optional
D．overlapping
单项选择题
The authors of the United States Constitution attempted to establish an effective national government while preserving ______ for the states and liberty for individuals.
A．autonomy
B．dignity
C．monopoly
D．stability
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