单项选择题

According to the theory of "risk homeostasis", some traffic accidents result from ______.

A．our innate desire for risk
B．our fast and reckless driving
C．our ignorance of seat belt benefits
D．our instinctive interest in speeding
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单项选择题
What social scientists have long felt puzzled about is why ______.
A．the mortality rate can not be predicted
B．the death toll remained stable year after year
C．a quota for each type of death has not come into being
D．people lost their lives every year for this or that reason
单项选择题
In his research, Gerald Wilde finds that technological advances and increases in safety standards ______.
A．have helped solve the problem of so high death rate
B．have oddly accounted for mortality rates in the past century
C．have reduced mortality rates for violent and accidental deaths,
D．have achieved no effect in bringing down the number of deaths
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