单项选择题

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

A．innate desire for risk
B．fast and reckless driving
C．ignorance of seat belt benefits
D．instinctive interest in speeding
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单项选择题
What social scientists have long felt puzzled about
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
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 on the bright side and developing a balanced level of risk.
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