单项选择题

Research shows that pupils who are good at math tend to be more conformist and （） than other pupils.

A．obscure
B．obvious
C．obedient
D．objective

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单项选择题

Which of the following activities was the responsibility of the federal government in the nineteenth century（）

A．Control of the manufacture of gunpowder.
B．Determining the conditions under which individuals worked.
C．Regulation of the supply of money.
D．Inspection of new homes built on western lands.

单项选择题

It can be inferred from the first paragraph that canals and railroads were （）

A．built with money that came from the federal government
B．much more expensive to build than they had been previously
C．built predominantly in the western part of the country
D．sometimes built in part by state companies