单项选择题

The bridge was named ______the hero who gave his life for the cause of the people.

A．after
B．for
C．because of
D．before

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单项选择题

It is implied but not stated in the passage that（）

A．there was a shortage of workers on America farms
B．the most important of the early invention was the iron plow
C．after 1869, many people devoted their attention to the plow
D．Charles New bolt had made a fortune by his cast-iron plow

单项选择题

At the opening of the nineteenth-century, farmers in America（）

A．preferred light tools
B．were extremely self-reliant (自给的)
C．had many tools
D．had very few tools