单项选择题

The Constitution's vague nature has given it the flexibility to be adapted when circumstances change.

A．imprecise
B．apparent
C．clear
D．easy
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单项选择题
A great deal has been done to remedy the situation.
A．maintain
B．improve
C．preserve
D．protect
单项选择题
Many economists have given in to the fatal lure of mathematics.
A．error
B．puzzle
C．attraction
D．contradiction
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