71 (Can love really last a lifetime?) Absolutely. 72 (But only if you believe the fairy tale of living happily for ever.) A team of scientists recently found that 73 (romantic love involves chemical changes in the brain that last 12 to 18 months. )After that, you and your partner are on your own. Relationships require maintenance. 74 (Pay a visit to nursing home if you want to see proof of lifelong love.) Recently I spoke to an old man whose wife of 80 years was suffering from advanced Alzheimer’s disease. 75 (He came to sit with her every day and hold her hand.) “she’s been my best friend since high school,”76 (he told me," We made a promise to stick together." )Now that is a love story. 注释：nursing home 养老院；Alzheimer’s disease 老年痴呆症 71—————————————————————— 72__________________________________ 76__________________________________ 73__________________________________ 74__________________________________ 75__________________________________