E
If you don’t have a college degree, you’re at greater risk of developing memory problems or even Alzheimer’s （老年痴呆）．Education plays a key role in lifelong memory performance and risk for mental disorder, and it's well documented that those with a college degree possess a cognitive（认知的） advantage over their less educated counterparts in middle and old age．
Now, a large national study from Brandeis University published in the American Journal of Geriatric Psychiatry shows that those with less schooling can significantly make up for poorer education by frequently engaging in mental exercises such as word s, puzzles, reading, and lectures．
“The lifelong benefits of higher education for memory in later life are quite impressive, but we do not clearly understand how and why these effects last so long,” said lead author Margie Lachman, a psychologist．She suggested that higher education may encourage lifelong interest in cognitive efforts, while those with less education may not engage as frequently in mental exercises that help keep the memory agile （敏捷地）．
But education early in hood does not appear to be the only route to maintain your memory．The study found that intellectual activities undertaken regularly made a difference．“Among individuals with low education, those who are engaged in reading, writing, attending lectures, doing word s or puzzles once a week or more had memory scores similar to people with more education,” said Lachman．
The study, called Midlife in the United States, assessed 3,343 men and women between the ages of 32 and 84 with a mean age of 56 years．Almost 40 percent of the participants had at least a 4-year college degree．The researchers evaluated how the participants performed in two cognitive areas, verbal memory and executive function --- brain processes involved in planning, abstract thinking and cognitive flexibility．Participants were given a battery of tests, including tests of verbal fluency, word recall, and backward counting．
As expected, those with higher education said they engaged in cognitive activities more often and also did better on the memory tests, but some with lower education also did well, explained Lachman．
“The findings are promising because they suggest there may be ways to level the playing field for those with lower educational achievement, and protect those at greatest risk for memory declines,” said Lachman．“Although we can not rule out the possibility that those who have better memories are the ones who take on more activities, the evidence is consistent with cognitive plasticity （可塑性）, and suggests some degree of personal control over cognitive functioning in hood by adopting an intellectually active lifestyle．”
57．What is the text mainly about?
A．Higher education has a better cognitive advantage．

B.Better memories result from college degree．

C.Cognitive activity does a mind good．

D.Poor education has more risk of memory declines．
58．According to the result of Margie Lachman’s study, we can conclude that ________．
A．education is responsible for the lifelong memory performance and risk for mental disorder