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  3. Everyone becomes a little more forgetful as they get older, but men’ s minds decline more than women’ s, according to the result

Everyone becomes a little more forgetful as they get older, but men’ s minds decline more than women’ s, according to the result

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问题    Everyone becomes a little more forgetful as they get older, but men’ s minds decline more than women’ s, according to the results of a worldwide survey. Certain differences seem to be inherent in male and female brains: Men are better at maintaining and dealing with mental images (useful in mathematical reasoning and spatial skills) , while women tend to excel at recalling information from their brain’ s files (helpful with language skills and remembering the locations of objects) .
   Many studies have looked for a connection between sex and the amount of mental decline people experience as they age, but the results have been mixed.
   Some studies found more age-related decline in men than in women, while others saw the opposite or even no relationship at all between sex and mental decline. Those results could be improper because the studies involved older people, and women live longer than men. The men tested are the survivors, " so they’ re the ones that may not have shown such cognitive decline," said study team leader Elizabeth of the University of Warwick in England.
   People surveyed completed four tasks that tested sex-related cognitive skills: matching an object to its rotated form, matching lines shown from the same angle, typing as many words in a particular category as possible in the given time, e. g. "objects usually colored gray", and recalling the location of objects in a line drawing. The first two were tasks at which men usually excel: the latter are typically dominated by women.
   Within each age group studied, men and women performed better in their separate categories on average. And though performance declined with age for both genders, women showed obviously less decline than men overall.
One important factor that affects the correctness of the results is that______.
选项 A、the old men tested may not have shown such cognitive decline
B、people surveyed are all old
C、people taking part in this test came from all over the world
D、women live longer than men
答案A
解析 根据第三段第二、三句“Those results could be improper because the studies involved older people…they’re the ones that may not have shown such cognirive decline…”可知，女性通常比男性更长寿，接受调查的是那些比同性更长寿的男性，他们可能还没有出现认知衰退的迹象，因此会影响调查的准确性。故选A。
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