单项选择题

According to researchers, Richard Nixon's death was _______.

A．caused by his heart problems.
B．indirectly linked to his wife's death.
C．the inevitable result of old age.
D．an unexplainable accident.
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单项选择题
One of the results of grief mentioned in the passage is _______.
A．loss of friendships.
B．diminished socializing.
C．vulnerability to disease.
D．loss of appetite.
单项选择题
The research reviewed in the passage suggest that _______.
A．remarried men live healthier lives.
B．unmarried men have the longest life spans.
C．widowers have the shortest life spans.
D．widows are unaffected by their mates' death.
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