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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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
单项选择题
In the background was that eternal hum.（）

A．long
B．never-ending
C．boring
D．extensive
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