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

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热门试题

单项选择题

A chief factor in bringing down the births in Europe in the 19th century is ______.

A．birth control
B．the desire to seek fortune in cities
C．the instability of marriage
D．the changed place of women

单项选择题

During the years from 1957 to 1976, the birth rate of the United States ______.

A．increased
B．experienced both falls and rises
C．was reduced
D．remained stable