当前位置 :
阅读理解阅读理解阅读下列短文,然后从各题所给的四个选项(A、B、C和D)中,选出最佳选项。Whydoescreamgobadfasterthanbutter?Someresearchersthinktheyhavetheanswer,anditcomesd
1人问答
更新时间:2024-04-26 04:15:44
问题描述:

阅读理解阅读理解

阅读下列短文,然后从各题所给的四个选项(A、B、C和D)中,选出最佳选项。

Whydoescreamgobadfasterthanbutter?Someresearchersthinktheyhavetheanswer,anditcomesdowntothestructure(结构)ofthefood,notitschemicalcomposition(成分)afindingthatcouldhelpbreakawayfromsomechemicals.Creamandbuttercontainprettymuchthesamethings,sowhycreamshouldgobadmuchfasterhasbeenaproblem.Botharesmallglobules(小球)ofoneliquidspreadthroughoutanother.Thedifferenceliesinwhat'sintheglobulesandwhat'sinthesurroundingliquid,saysBrocklehurst,wholedtheresearch.Incream,fattyglobulesdriftaboutinaseaofwater.Inbutter,globulesofawateryroadarelockedawayinaseaoffat.Thebacteria(细菌)whichmakethefoodgobadprefertoliveinthewateryareasofthemixture.“Thismeansthatincream,thebacteriaarefreetogrowthroughoutthemixture,”hesays.Wheninbutter,thebacteriaarelockedawayinlockedplacesburieddeepintheseaoffat.Trappedinthisway,thosecoloniescannotspreadandrapidlyrunout.Theyalsoslowlypoisonthemselveswiththeirwasteproducts.“Inbutter,yougetaself-limitingsystemwhichstopsthebacteriagrowing,”saysBrocklehurst.Theresearchersarealreadyworkingwithfoodcompanieseagertoseeiftheirproductscanbemadetostandbacterialattackthroughchangesofthefoods'structure.Brocklehurstbelievesitwillbepossibletomakesomethingusedinsaladcreamforinstance,morelikethatinbutter.Thekeywillbetodothiswhilekeepingthesaladcreamliquidandnotturningitintoasolidstate.

1.Accordingtotheresearchers,creamgoesbadfasterthanbutterbecausebacteria________.

[]

A.arestrongerincream

B.increasetheirnumbermoreeasilyincreamthaninbutter

C.liveonlessfatincreamthaninbutter

D.producelesswasteincreamthaninbutter

2.AccordingtoBrocklehurst,wecankeepcreamfreshby________.

[]

A.removingitsfatB.killingthebacteriaC.reducingitswaterD.changingitsstructure3.Theunderlinedword“colonies”refersto________.

[]

A.tinyglobulesB.wateryregionsC.bacteriasocietyD.littledepartments4.Commerc

范子彦回答:
  B;D;C;D
最新更新
PC端 | 移动端 | mip端
问答网(wenda2.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。

邮箱:联系方式:

Copyright©2009-2021 问答网 wenda2.com 版权所有 闽ICP备2022000227号-1