单项选择题

It is postulated that population trends have an effect on economic fluctuations.（）

A. deducted
B. assumed
C. decreed
D. challenged

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单项选择题

Given the persistent and intransigent nature of the American race system, which proved quite impervious to black attacks, Du Bois in his speeches and writings moved from one proposed solution to another and the salience of various parts of his philosophy changed as his perceptions of the needs and strategies of black American shifted over time.（）

A. vigilant
B. inadvertent
C. impenetrable
D. incongruous

单项选择题

One difficulty is that while other disciplines investigate a specific range of phenomena, philosophy, particularly in the hodgepodge conception, investigates all of existence.（）

A. potpourri
B. consensus
C. feint
D. nuance

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