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中国联通。囵米议芯令6.l77%*1早上821small sections of human brain tissue made from stem cells in a special container.Butnt asna6wins,g停经)元don'tohichmroca血onedow,said Serguasca,the study's lead author from Stanford University.Tooverom such restrictiTsearciesioplaniodtkcgoupingoftumanbaincels,calcdorganoits,intotebnainsofyoungrts.2014.Hmv implanted nttr but mr sdevelopnay inceriimting how well implanted cells c interale.ypating them at theseearlywras aodhattesecanorelatively arged reversad they c coveraboutfrat's brain,"said Pasca.nautkingToesthowwell the human eros integrated with the rat brains and bodis,air was blownours thewellanimals'whiskers,which prompted elctrica activity in the human neurons.That showed that xtemalstimulation of the rat's body was processed by the human brain tissue.The scieiststhedct another test in the oppositeorder They implanted human brain l whichcould respond to blue light,and then trained the rats to expect a"reward"of water from a pipe when blue lightshoneon the neurons via a cable in the animals'brain.After two weeks,they found pulsing the blue light sent therats scrambling to the pipe.The team has now used the technique to show that organoids developed from patients with Timothysyndrome grow more slowly and display less electrical activity than those from healthy people.Tara Spires-Jones,a professor at the University of Edinburgh's UK Dementia Research Institute,said thework"has the potential to advance what we know about psychiatric disorders."28.Why did scientists researchon rats instead of the special container?A.Because psychiatric disorders are too complex.B.Because rats also suffer similar psychiatric illessesC.Because it limits the growth of human brain nerons.D.Because human bran ern rowtoo quckly int29.What can be inferred from Paragraph 3?A.Rats'e has a sigificant innn the rearch.B.Hunmanbrnincelscan'tbeimplantedintoadtltrats.C.Rats'brai o'evelp if they rvehumD.Hmlargerintyouns'30.Whyid theercyoumoreA.TomimaionsB.otie t atsandmiCTocoaimhemanbaincelbcouldgowwelaas'bneinsube stoasbody.in31.What is the significance of the research?