单项选择题

The primary purpose of the text is to

A．support an alternative to an accepted methodology.
B．present evidence that resolves a contradiction.
C．introduce a recently discovered source of information.
D．challenge a widely accepted explanation.

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单项选择题

According to the text, which of the following is true of wages in southern cities in 1910

A．They were being pushed lower as a result of increased competition.
B．They began to rise so that southern industry could attract rural workers.
C．They had increased for skilled workers but decreased for unskilled workers.
D．They had increased in large southern cities but decreased in small southern ones.

单项选择题

The author's attitude toward the service-education concept is

A．radical.
B．impartial.
C．optimistic.
D．supportive.