单项选择题

American presidents seem to age before our eyes. But common belief that high-office stress grays our leaders faster than --62-- may be a myth, new research finds. In fact, the majority of American presidents have lived longer than --63-- men of their times. That’s not to --64-- that chronic stress has no effect on a person’s lifespan, but -65-- does high social standing. The findings --66-- to a body of research linking high status to better health: --67-- , Oscar winners live longer than those who were only --68-- ; and the longevity (长寿) effect is also seen in Nobel Prize winners. The new study, which was published in the Journal of the American Medical Association --69-- the dates of birth, inauguration and death of all 34 past presidents who died of natural causes. The --70-- lifespan for these men should have been 68 years， --71-- they’d aged twice as fast during their years in --72-- as the popular wisdom suggests they do. --73--, the study found, these presidents lived an average 73 years. And indeed, 23 of the 34 presidents who died of natural causes lived longer than --74--, compared with other men their age during their lifetimes. Some presidents --75-- an exceptionally long time: Gerald Ford died at 93.5 years, and Ronald Reagan at 93.3. All --76-- living presidents have already exceeded their life --77--, or are likely to do so. So why do people --78-- the top of the hierarchy fare better than those below --79-- to wealth, education and the best health care of their times would seem to be obvious factors --80-- medical attention seems to have actually killed President Garfield, who died from a fatal --81-- introduced by his doctors’ unsterile (未消过毒的) treatment techniques after he was shot by an assassin .

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