1.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
2.For three quarters of its span on Earth， life evolved almost ________ as microorganisms.
[A] precisely [B] instantly
[C] initially [D] exclusively
3.The introduction of gunpowder gradually made the bow and arrow ________， particularly in Western Europe.
[A] obscure [B] obsolete
[C] optional [D] overlapping
4.Whoever formulated the theory of the origin of the universe， it is just ________ and needs proving.
[A] spontaneous [B] hypothetical
[C] intuitive [D] empirical
5.The future of this company is ________： many of its talented employees are flowing into more profitable net-based businesses.
[A] at odds [B] in trouble
[C] in vain [D] at stake
参考答案：ADBBD
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