单项选择题

John is collaborating with Mary in writing an article（）

A．cooperating
B．marrying
C．combining
D．arguing

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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

Many economists have given in to the fatal lure of mathematics．（）

A．error
B．puzzle
C．attraction
D．contradiction

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