单项选择题

Few people realize how rich that area is. It is a land of treasure（）treasure.

A. increased by
B. derived from
C. turned over
D. piled on

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单项选择题
Nobody yet knows how long and how seriously the （）in the financial system will drag down the economy.

A. shallowness
B. shakiness
C. scantiness
D. stiffness
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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