[单项选择]Many people wrongly believe that when people reach old age, their families place them in nursing homes. They are left in the (67) of strangers for the rest of their lives. Their (68) children visit, them only occasionally, but more often, they do not have any (69) visitors. The truth is that this idea is an unfortunate myth--an (70) story. In fact, family members provide over 80 percent of the care (71) elderly people need. Samuel Preston, a sociologist, studied (72) the American family is changing. He reported that by the time the (73) American couple reaches 40 years of age, they have more parents than children. (74) , because people today live longer after an illness than people did years (75) , family members must provide long term care. More psychologists have found that all caregivers (76) a common characteristic: All caregivers believe that they are the best (77) for the job. In othe