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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The river widensconsiderably as it begins to turn west.
A．extends
B．stretches
C．broadens
D．bends
单项选择题
These are the motivesfor doing it.
A．reasons
B．excuses
C．answers
D．replies
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