单项选择题

According to the passage, which of the following may contribute to a longer life span

A．Showing adequate trust instead of suspicion of others
B．Eating the food low in fat and driving with great care
C．Cultivating an optimistic personality and never losing heart
D．Looking 6n the bright side and developing a balanced level of risk
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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
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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