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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单项选择题
In his research, Gerald Wilde finds that technological advances and increases in safety standards have ______.
A．helped solve the problem of so high death rate
B．oddly accounted for mortality rates in the past century
C．reduced mortality rates for violent and accidental deaths
D．achieved no effect in bringing down the number of deaths
单项选择题
By saying ... statistically canceling out the benefits that the seat belt confers in the second paragraph the author means ______.
A．wearing seat belts does not have any benefits from the statistic point of view
B．deaths from wearing seat belts are the same as those from not wearing them
C．deaths from other reasons counterbalance the benefits of wearing seat belts
D．wearing seat belts does not necessarily reduce deaths from traffic accidents
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