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

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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

单项选择题

The population in the 21st century according to the writer ______.

A．will be smaller than a fw years ago
B．will not be as small as people expect
C．will prove to be a threat to the world
D．will not consitute as serious a problem as expected