1 Advancing age means losing your hair, your waistline and your memory， right ? Dana Denis is just 40 years old，but 1 she’s worried about what she calls’ my rolling mental blackouts.” ”I try to remember something and I just blank out，” she says.　　You may 2 about these lapses，calling them ” senior moments ”or blaming "early Alzheimer’s (老年痴呆症).”Is it an inescapable fact that the older you get，the 3 you remember? Well, sort of. But as time goes by, we tend to blame age 4 problems that are not necessarily age—related.　“When a teenager can’t find her keys，she thinks it's because she’s distracted or disorganized，” says Paul Gold.“A 70-year-old blames her 5 .” In fact，the 70-year-old may have been 6 things for decades.　　In healthy people，memory doesn’t worsen as 7 as many of us think.“As we 8 ，the memory mechanism isn’t 9 ，” says psychologist Fergus Craik.”It’s just inefficient.”　　The brain’s processing 10 slows down over the years，though no one knows exactly 11 . Recent research suggests that nerve cells lose efficiency and 12 there’s less activity in the brain.But，cautions Barry Gordon，”It's not clear that less activity is 13 . A beginning athlete is winded(气喘吁吁)more easily than a 14 athlete.In the same way, 15 the brain gets more skilled at a task，it expends less energy on it.”　　There are 16 you can take to compensate for normal slippage in your memory gears，though it 17 effort. Margaret Sewell says：” We’re a quick-fix culture, but you have to 18 to keep your brain. 19 shape. It's like having a good body. You Can’t go to the gym once a year 20 expect to stay in top form.”A、almostB、seldomC、alreadyD、never