Unit 4 单元话题阅读理解练习-2022-2023学年高二英语选择性必修第二册单元重难点易错题精练（牛津译林版2020）.docx

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Unit 4 单元话题阅读理解练习-2022-2023学年高二英语选择性必修第二册单元重难点易错题精练（牛津译林版2020）.docx

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试卷第=page11页，共=sectionpages33页

Unit4单元话题阅读理解练习

(名校必威体育精装版真题)

（2022·江苏南京·高二开学考试）WhenSpaceX’s20thmissionliftedofftotheInternationalSpaceStation,beatingheartcellswerealongfortheride.After22days,theheartcellswerereturnedtoEarth-andtheywerestillbeating.ThisexperimentmarksasignificantsteptowardhelpingheartpatientsonEarthinthefuture.

Thebeatingheartcells,calledcardiomyocytes(心肌细胞),weregrownfromstemcells.“They’relikemagiccellsbecausetheycanturnintoalmostallkindsofcellsinourbody,includingbeatingheartcells.Theheartcellshavethepotentialtotreatheartdiseaseforkidsandadults.Buttorepairadamagedheart,wewillneedalotmorecardiomyocytes.Andsometimesit’sreallyhardtogetthatmanycellstogrow,”?saidChunhuiXu,researcherandassociateprofessorofpediatricsatEmoryUniversitySchoolofMedicine.

Whenherexperimentusingsimulatedzero-gravityonEarthshowedpromisingstepstowardquicklyandsafelyproducingcardiomyocytes,Xusawspaceastheprovingground.Her?experiment?waschosentoflyonthespacestationinordertodeterminehowtheabsenceofgravityimpactsstemcellsthatareessentiallyturnedintoheartcells.

Theheartcellswerefrozen,andthenthawed(解冻)oncetheyreachedthestation.Thisallowedthecellstogrowinspacefor21days.NASAastronautJessicaMeiroversawtheexperiment.“Thisone-of-a-kindplaceiswhatmakesdoingresearchontheInternationalSpaceStationsoincrediblyspecial.Wecantestthingsthatwecan’tdoanywhereonEarth,”Meirsaid.

WhentheselivecellsreturnedtoEarth,Xuandhercolleaguesdiscoveredthatthestemcellsgrowfasterinzerogravity.Thisrapidabilitytogrowcardiomyocytescouldgeneratealargenumberofhealthyheartcellsforchildrenandadultswithvariousheartdiseases.Withthesenewfindings,theresearchcouldleadamoreefficientandcost-effecti