Passage 2

A．there is a global economic crisis in recent years.
B．there are fewer babies, and consequently, people spend less on many commodities.
C．people in these countries have fewer children than needed to replace the population for many years.
D．there are tremendous strains on public coffers and the economy as a whole.

A．there is almost no clue to the identity of both sexes.
B．the role distinction between different sexes is conspicuous.
C．the different definitions of sexes bears on the development of culture.
D．the progress of civilization greatly influences the role definitions of sexes.