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
Which of the following statements 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.
单项选择题
The social scientists have long felt confused about the fact that______.
A．2,500 people accidentally commit suicide every year
B．the death rates remained stable year after year
C．a quota for each type of death has not established
D．people lost their lives every year for this or that reason
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