There was a large crowd in the square ______against the war.

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

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