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years.Next,the volunteers completed 12 cognitive (tests assessing their mental abilities.They faced specially designed memory exercises,such as mentally rotating objects,pattern-finding puzzles and strategy challenges.When looking at the results,researchers saw that brain trainers on average had no mentaledge.Even among the most dedicated,who had used training programs for at least 18 months,brain training didn't boost thinking abilities above the level of people who didn't use theprograms.Participants who had trained for less than a month,also performed on par with peoplewho didn't train at all."No matter how we sliced the data,we were unable to find any evidence that braintraining games were connected with cognitive abilities,"says leader of the team.That held truewhether the team analyzed participants by age,program used,education or socioeconomicstatus-all were cognitively similar to the group who didn't use the programs,suggesting thatbrain training games don't live up to its name.Accordingly,the study advocates no more timesitting at a computer and doing little tasks.24.How does the author introduce the topic?A.By questioning an idea.B.By having a debate.C.By explaining an example.D.By making a comparison.25.What can be learned about the brain training games from the research result?A.They cost time to play well.B.They improve mental abilities.C.They aren't as helpful as imagined.D.They aren't so popular as before.26.Why do the researchers analyze the data from different angles?A.To engage more participants.B.To further confirm the research result.C.To test the limitation of the researchD.To provide evidence for the association.COn June 7,1195,a fiery spinning ball emerged from a dark cloud in the sunny sky closeto the London city.An account of this extraordinary moment survives in a chronicle (between about 1180 and 1199 by Gervase.It would appear that this is the first credible recordof ball lightning in England,and much more convincing than the earliest European description,which was believed to be from the 17th century.Historians discovered the account of what appears to be ball lightning while exploringGervase's records of natural events in his chronicle,a treasure of historical details givinginsights into medieval culture.They dug through hundreds of pages in Latin and came acrossthis sighting.Gervase's records of natural events appear within the historical narrative,often市高三英语试题第5页共10页