当前位置 :
【阅读理解Mostpeoplewouldagreethatitwouldbewonderfulifhumanscouldregenerate(再生)limbs.Thosewhohavelosttheirarmsorlegswouldbecompleteagain.Thedayisstillfaroffwhen】
更新时间:2024-04-26 16:56:04
1人问答
问题描述:

(1)

阅读理解

Mostpeoplewouldagreethatitwouldbewonderfulifhumanscouldregenerate(再生)limbs.Thosewhohavelosttheirarmsorlegswouldbecompleteagain.Thedayisstillfaroffwhenthismighthappen.Butinthelast10yearsdoctorshavereportedregenerationinsmallerpartsofthebodymostoftenfingers.

Regenerationisnotanewly-discoveredprocess.Forcenturiesscientistshaveseenitworkinsomekindsofanimals.Scientistsnowarelookingforawaytoturnonthisexcitingabilityinmorehighly-developedanimalsincludinghumans.Theirexperimentsshowthatnerves(神经)cellchemistryandthenaturalelectriccurrentsinthebodyallseemtohaveapartinthisprocess.

Thebodyofeveryanimalcontainsgeneralpurposecellsthatchangeintowhateverkindofcellsthebodyneeds.Thesecellscollectaroundthewound.Theyformamasscalledablastema(芽基).Thecellsoftheblastemabegintochange.Somebecamebonecellssomemusclecellssomeskincells.Slowlyanewpartre-growsfromthebodyo

utward.Whencompletedthenewpartisjustliketheoldone.

Morethan200yearsagoItalianscientistLuigiSpallanzanishowedthatyoungeranimalshaveagreaterabilitytoregeneratelostpartsthanolderanimals.Sodoanimalslowerontheladderofevolutionary(进化的)development.Themajordifferencesseemtobethatless-developedanimalshavemorenervesintheirtailsandlegsthanhumansdointheirarmsandlegs.

Anotherhelpfulpieceofinformationwasdiscoveredinthelate1800s.Scientistsfoundthatwhenacreatureisinjuredanelectricalcurrentflowsaroundthewound.Thestrengthofthecurrentdependsonhowseverethewoundisandonhowmuchnervetissue(组织)ispresent.

Accordingtothepassagelimbregeneratio

黄文恺回答:
  答案:1.C;2.B;3.A;4.D;   解析:   (1)第一段中Thedayisfaroffwhen…….(2)字面理解题。(3)第四段最后一句。
英语推荐
最新更新
我查吗(wochama.com)汇总了汉语字典,新华字典,成语字典,组词,词语,在线查字典,中文字典,英汉字典,在线字典,康熙字典等等,是学生查询学习资料的好帮手,是老师教学的好助手。
声明:本网站尊重并保护知识产权,根据《信息网络传播权保护条例》,如果我们转载的作品侵犯了您的权利,请在一个月内通知我们,我们会及时删除。
电话:  邮箱:
Copyright©2009-2021 我查吗 wochama.com 版权所有 闽ICP备2021002822号-4