单项选择题

The passage implies that American pig iron was _______.

A．low in cost and high in quality
B．low in cost and low in quality
C．high in cost and high in quality
D．high in cost and low in quality
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单项选择题
English iron smelters and English iron manufacturers were both opposed to _______.
A．high import taxes on American pig iron
B．the growth of iron manufacturing in America
C．the shipping of iron products to America
D．selling English wool to the colonists
单项选择题
The author states that the smelting of iron ore in England _______.
A．developed rapidly after 1710
B．was controlled by owners of forests
C．helped the sale of cloth
D．was threatened by smelting in America
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