单项选择题

It can be inferred from the passage that by 1860 ______.

A．half of the population lived to the west of Appalachian Mountains
B．Americans had long been desirous of new territories
C．westward expansion was a solution to the conflicts between the two parties
D．America's industry was highly developed

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单项选择题

It can be inferred from the passage that ______.

A．slavery in the South was an evidence of American's racism
B．Indians were driven out of their homes into the west
C．Americans were threatened by wars during 1840s
D．Americans won their independence through westward expansion

单项选择题

The sentence From costing nothing children suddenly come to seem impossibly expensive (Para. 2) implies that ______.

A．food and clothing for babies are becoming incredibly expensive
B．prices are going up dramatically all the time
C．to raise children women have to give up interesting and well-paid jobs
D．social development has made child-raising inexpensive