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 river widens considerably as it begins to turn west（）

A．extends
B．stretches
C．broadens
D．bends
单项选择题
These are the motives for doing it（）

A．reasons
B．excuses
C．answers
D．replies
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