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
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
单项选择题
The main topic of this passage is the _______.
A．development of the English iron manufacturers and wool merchants
B．disagreement between English iron manufacturers and wool merchants
C．arguments for and against import taxes on American pig iron
D．growth of shipping between England and America
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