2018年6月大学英语六级听力常考时文：Factors for Colds

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　　1.Who are the most cold-ridden group? ...
        　　2.Why do women in their twenties show a rise in cold infections? Because
they are most likely to ...
        　　3.What else, besides age, plays an important role in susceptibility to
colds? ...
        　　4.What kind of families suffer more colds? Families with ...
        　　A critical factor that plays a part in susceptibility to colds is age. A
study, done by the University of Michigan School of Public Health，revealed
particulars that seem to hold true for the general population. Infants are the
most cold-ridden group，averaging more than six colds in their first years. Boys
have more colds than girls up to age three. After the age of three，girls are
more susceptible than boys，and teenage girls average three colds a year to boys’
two. The general incidence of colds continues to decline into maturity. Elderly
people who are in good health have as few as one or two colds annually. One
exception is found among people in their twenties，especially women，who show a
rise in cold infections，because people in this age group are most likely to have
young children. Adults who delay having children until their thirties and
forties experience the same sudden increase in cold infections. The study also
found that economics plays an important role. As income increases，the frequency
at which colds are reported in the family decreases. Families with the lowest
income suffer about a third more colds than families at the upper end. Lower
income generally forces people to live in more cramped quarters than those
typically occupied by wealthier people，and crowding increases the opportunities
for the cold virus to travel from person to person. Low income may also
adversely influence diet. The degree to which poor nutrition affects
susceptibility to colds is not yet clearly established, but an inadequate diet
is suspected of lowering resistance generally.