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A．Husband and wife.
B．Teacher and student.
C．Father and daughter.
D．Friends.
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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

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