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than adults.A study published in Current Biology finds that children and adults have different concentrations of akey brain messenger called gamma-aminobutyric acid,or GABA.This messenger slows down the brain byblocking specific signals in the body's central nervous system.It also produces a calming effect and isthought to play a major role in controlling the overactivity of nerve cells associated with anxiety,stress andfear.All these contribute to the learning of new things.In the study,the researchers from Brown University used neuro-imaging techniques to examine visualperceptive(视觉感知的)learning in elementary school-aged children and adults.Participants were showna number of different images and were later asked questions about them following the test.Visual learning caused an increase of GABA in children's visual cortex,the area of the brain thatprocesses visual information.However,GABA levels didn't change in the adults who took the same visualtests.In addition,children participants kept that GABA increase for hours after training ended,while theconcentrations of GABA remained the same in the adults studied."In subsequent behavioral experiments,we found that children indeed learn more items within a givenperiod of time than adults."said Sebastian M.Frank,the co-author of the study."Our results therefore pointto GABA as a key player in making learning more efficient in children."These results,the authors argue,should encourage teachers and parents to keep giving childrenopportunities to learn anything from riding a bike to playing an instrument throughout their childhood.The findings may also change neuro-scientists'conception of brain maturity in children."Althoughchildren's brains are not yet fully mature and many of their behavioral and cognitive functions are not asefficient as in adults,children are not,in general,surpassed in their learning abilities by adults,"said studyco-author Takeo Watanabe.28.What's the function of GABA?A.Send specific messages to the brain.B.Deal with complex math problems.C.Make the nervous system more active.D.Increase efficiency in learning new things.29.What do we know about the children taking the visual test?A.Their GABA concentrations kept increasing after training.B.Their learning abilities still needed to be improved.C.They could remember more images than adults.D.They were surpassed by adults in learning abilities.30.How did the researchers do the research?A.By comparing participants'reaction.B.By analyzing statistics.C.By collecting relative evidence.D.By conducting online survey31.What does Takeo Watanabe want to say in the last paragraph?A.Neuro-scientists don't fully understand brain maturity in children.B.Children are not mature in their behavior and cognition.C.It takes a long time for children's brains to be fully mature.D.Children's brain maturity does not affect their learning abilities.DArtificial intelligence(AI)models have long surpassed just creating text responses and images.Now,with only one sentence,Open AI's latest text-to-video model,Sora,can turn your words into video with高二英语学科试题第5页共10页