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题目材料：
Most of the studies of the effect of aging on short-term memory have led researchers to conclude that younger adults perform short-term-memory tasks better than people over the age of 65. But these studies were all conducted in afternoon sessions. In a recent study conducted both in morning and in afternoon sessions. the older participants performed much better in morning sessions than in afternoon sessions. The younger participants did not, however, perform any better in the morning.
The statements given are structured to lead to which of the following conclusions
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A.Most previous studies led researchers to underestimate the ability of older adults to perform short-term-memory tasks
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B.In the morning, people over 65 perform short-term-memory tasks better than younger adults do
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C.There is no significant overall difference in long-term memory between older adults and younger adults
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D.The results of most previous studies of the effect of aging on short-term memory are best interpreted as showing that age has no effect on the ability to perform short-term-memory tasks
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E.Younger adults are able to perform short-term-memory tasks better if they perform them in the afternoon than if they perform them in the morning
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