2023年职称英语等级考试模拟题及答案.docx

2０23年职称英语等级考试模拟题（理工类Ｂ级）
第1部分：词汇选项(第１~15题，每题1分，共15分)
　 下面每个句子中均有1个词或短语划有底横线，请为每处划线部分确定1个意义最为靠近旳选项。
1. The nｕrsｅry ｉｓ brigｈt and ｃheeｒfｕl．
A． pleaｓant 　 　 B. cｌｅａn　　 　 C. ｐeaｃefuｌ 　 　 　 D. lａｒｇe
２. Thiｓ　kind oｆ　materiaｌ　was seldom　ｕseｄ　iｎ　ｂuｉldinｇ hｏｕsｅs　dｕｒinｇ tｈｅ Ｍｉｄdlｅ Aｇes.

Ａ． neveｒ　 　 　 B． rarely　　　　　 　C.　ofｔen 　　 　 Ｄ.　only
3.　Pｅoｐle ｆrom many　ｐｌacｅs were drawｎ　to ｔhe ciｔy bｙ ｉtｓ　growinｇ eｃｏｎｏｍy.
A．　feｔｃhed　 　 　　 B. carried　 　 　 C． ａttrａcted　 　 　　　 D． pushｅd
4. Thｅ ｓｏｌdier displａyｅd ｒemarkable courａｇe iｎ thｅ bａttlｅ．
A. placeｄ 　 B.　showeｄ 　　C． pｏiｎted 　 D. ｄecｉｄｅd
5. Hoｗ　ｄｏ ｙou account　fｏr your aｂsence from　the　ｃlasｓ lasｔ Tｈuｒｓday?
Ａ. eｘplaiｎ 　 　 B. examｉne 　 　Ｃ．　ｃｈoose 　　 　 　 D. expａｎd
6. Ａbouｔ ｏne　quａrter of thｅ woｒkeｒs ｉn tｈe　ｃouｎｔry are　employed iｎ　facｔorｉeｓ.
　A. third 　 　 Ｂ. fourｔh　 　 　　Ｃ. ｔeｎth 　 　 D. fifｔeenth
7． Ｓhe was gｒａteful to　him for　being　so gooｄ to　her.
Ａ． carｅful 　 B． hateful 　　 C.　beautiful 　 　 　 　 D. thankful
8. Thｅrｅ ａrｅ　onｌy fivｅ ｍｉｎuｔes ｌeft, bｕt the　oｕtｃome ｏf thｅ ｍatch is　still　iｎ dｏｕbt.
　A. rｅsｕlｔ 　 　 　 Ｂ.　judgement 　 C. estｉｍatｉoｎ　 　 　　 D． evｅnｔ
9.　Hｅ　is ｃertain　that　thｅ　diｃtionarｙ iｓ ｊusｔ whａt I ｗant．
A．　sure　 　 　 Ｂ.　aｎgry 　 　　 　C. dｏｕbtｆul 　 　 　 Ｄ. woｒｒｉeｄ
10.　Ｔhe lａsｔ fｅw ｗeeks hａve　ｂeｅn enjoyable.
　Ａ． ｃｌoｓe 　 　B.　ｎｅａr　　　 　　 C. past 　 　 　 Ｄ.　ｓeveral
11.　What wｅre the coｎseｑuences of thｅ dｅcｉsｉoｎ sｈe had made?
A. ｒeaｓons 　　 Ｂ. reｓultｓ　 　 　 　 Ｃ. causes 　　 　　 　D. bases
12． Theｙ　didn't realizｅ hoｗ　serious ｔhｅ probleｍ wａs.
　A. know 　 　 　 B. foｒgｅt 　 　 C. doｕbt 　 　 　 　Ｄ. remembｅｒ
1３. We shall kｅep tｈe money iｎ　a ｓecｕrｅ place.
　A.　cｌean 　　 　 　B. secret 　　ﻩ　　 C． diｓtａnt 　 　 D. safe
14.　Tｈｅ　greaｔ ｃhanｇeｓ of ｔhe city　astonished　ｅvery　vｉｓitor tｏ that cｉｔy
A.　attackｅd 　 　 Ｂ. suｒprisｅｄ　 　 C.　attrａcｔed　　 　 Ｄ. inｔereｓtｅd
15. Tｈe ciｔy haｓ ｄｅｃideｄ　to ｄo away with all ｔhｅ ｏlｄ ｂｕildｉngs in its ｃｅnter.
A. gｅt ｒid of 　　 　 　B. ｓeｔ up　 　　 　 Ｃ. reｐａｉr 　 　 　 Ｄ. paｉnt
第２部分：阅读判断(第16～22题,每题1分，共７分)
下面旳短文后列出了7个句子，请根据短文旳内容对每个句子做出判断:假如该句提供旳是对旳信息，请选择Ａ;假如该句提供旳是错误信息，请选择B;假如该句旳信息文中没有提及,请选择C。
Ｄａngers Await Ｂabｉes wiｔh　Alｔiｔuｄe
Wｏｍeｎ ｗho liｖe iｎ ｔｈe world’ｓ highest　commｕnitiｅｓ tend ｔo gｉvｅ　birth tｏ　uｎdｅrｗeigｈｔ babiｅｓ, a nｅw ｓtudy　sｕggests. Thｅse babies　mａy grow ｉnｔo ａduｌｔｓ ｗith a hiｇh　riｓk　of heaｒt dｉseａｓe ａnd ｓtrokeｓ.　
Resｅａｒｃh ｈaｓ hｉｎtｅd　ｔhat neｗbornｓ in mouｎｔａiｎ coｍmunitｉeｓ are ligｈｔer tｈan　aveｒａge． But it　wasn’t　cleaｒ wｈｅther ｔhis is　ｄue tｏ ｒedｕceｄ oxygeｎ leveｌｓ aｔ　high ａltitｕdes or bｅｃａuse their mｏｔｈｅｒｓ are unｄer-nouriｓhed —　mａｎｙ ｐeople ｗｈo　live ａt hiｇｈ altituｄes　aｒｅ rｅlatｉveｌy　ｐoor coｍpａred with ｔｈosｅ livｉng ｌower down.
Ｔo find ｏut ｍｏrｅ, Dｉｎo Giusｓaｎi and his ｔｅam　at Cambrｉｄge　Uniｖerｓity　sｔudｉｅｄ thｅ records　ｏf 4００　birｔhs iｎ　Ｂolivｉa ｄuriｎg 1９97 and 19９8. Tｈe　babｉes　werｅ　born iｎ　both ricｈ anｄ poor areａs of ｔwo citｉes:　La Paｚ and Sａntａ Crｕz. La Ｐaｚ is ｔｈｅ hiｇｈesｔ　ｃity　ｉn tｈe woｒｌｄ， at 3.６5 ｋiloｍeterｓ abｏvｅ sea lｅｖel, whｉlｅ　Santａ　Ｃｒｕz is mｕch loｗer, at 0.４4 kilomｅｔers.　
Sｕｒｅ　enouｇh， Giussａnｉ fouｎd ｔhat thｅ avｅrage birthｗeighｔ of ｂａbｉｅs　iｎ La　Paz ｗas　ｓignifｉｃａnｔly　loｗer than ｉn Saｎtａ Ｃruz.　Thiｓ wａs tｒuｅ in both hｉｇｈ　and ｌow－iｎｃome ｆaｍｉlｉｅｓ. Even babiｅs　ｂorn to poor ｆaｍｉlieｓ　ｉn Saｎta Cruｚ were hｅａvｉｅｒ　on averagｅ thaｎ ｂabieｓ ｂorn ｔｏ　wealthy ｆaｍilies iｎ ｌoｆty La Pａz． “We ｗeｒe vｅry ｓurpriｓed　by this　resuｌｔ,” ｓays　Giussaｎi.
Ｔhe results sugｇest tｈat　baｂies boｒｎ ａｔ ｈigh ａlｔｉtｕdes ａre　dｅprivｅｄ of２ oxｙgeｎ ｂefｏre bｉrtｈ. “This ｍaｙ ｔrigger thｅ　rｅleasｅ oｒ supprｅssioｎ oｆ　hormones tｈat　regulate gｒowth of the unborn chｉlｄ,”　says Gｉusｓani.
His　team　alｓｏ　fｏund thａt　high－altｉｔuｄe babｉes teｎdｅd ｔo　have ｒelativelｙ　lａｒger hｅads coｍｐared with ｔheｉr bｏｄｉes. Thｉs ｉs ｐrobaｂlｙ beｃause ａ　feｔus　staｒved of oxygen wiｌｌ sｅnd oｘygenated　blood ｔo ｔｈe ｂraｉn　in preferenｃｅ ｔｏ　thｅ　reｓt of the ｂoｄy．　
Ｇiussani waｎts to ｆind　out if such babieｓ　have　a higher　ｒiｓk of dｉseaｓe in lａtｅｒ liｆe． Ｐeople born in Ｌa Paz ｍigｈｔ ｂe　ｐrone to　heart troubｌe　in adulthoｏd, for　examplｅ.　Loｗ birth　ｗｅiｇht ｉs a　risｋ factoｒ ｆor coｒｏnaｒｙ heａrt diｓeａｓe. And　newboｒns wiｔh　a high raｔio of　heａd size to bｏdｙ wｅighｔ are oｆten　prｅdiｓpoｓed to high　blood　ｐｒeｓsｕre aｎd strokｅs in　lateｒ ｌife.　

16.　Accordｉng to ｔｈe ｐａｓsage，one　of the reasｏns　whｙ　newboｒｎs　in ｍoｕnｔain coｍmuｎｉｔiｅs arｅ　underweiｇht　is thaｔ　ｔｈeiｒ moｔhers ａｒe uｎder－noｕrisｈed.
A. Ｒigｈt B． Wronｇ C. Ｎot　mentionｅd
17．　Giuｓsａni’s teａm ｍeｍｂers　aｒｅ all Bｒitiｓh researｃheｒs　and　pｒｏfessors ｆrom Camｂｒｉｄge Uniｖersity．　Ａ. Riｇhｔ B. Wrong 　　 C. Not mentｉoneｄ
18．　Gｉｕｓsani　did noｔ ｅxpect to　fiｎd thaｔ ｔhe weight ｏｆ　a baby haｄ　ｌittle to do wiｔh ｔｈe fｉnanciａl　condｉtｉons　ｏf tｈｅ family ｈe was boｒｎ iｎｔo．　
A. Rigｈt B. Ｗｒｏｎg C. Not mentioｎeｄ
１9. The wｅight of　a newｂorn　hａs　ｔｏ ｄo wｉth the supｐly　of ｏxygen ｅｖｅn ｗｈen hｅ waｓ stｉｌl in his ｍotheｒ’ｓ womb.
Ａ． Rｉght B. Wrｏnｇ C． Not ｍｅntｉｏned
2０. Hｉgh-altｉtuｄe bａbies ｈave ｈｅads ｔhat ａre ｌａｒger　ｔhan ｔheir ｂoｄies.
A． Rigｈt Ｂ.　Wｒｏnｇ 　 C. Noｔ mｅｎtioned
21. Hiｇｈ-ａｌtitｕｄe ｂabies ｈavｅ lｏngeｒ but ｔhinner　lｉｍbｓ tｈａｎ average.　
A． Ｒighｔ　　 B． Ｗｒｏｎg　　　　C. Not　meｎｔｉoned
22． Gｉussａnｉ　haｓ arrivｅd at tｈe ｃoncｌusｉｏｎ ｔｈat ｂabies　iｎ ｈｉgh－ａｌｔitｕde rｅgions　are ｍore ｌikely tｏ have ｈeaｒt trouble ｗheｎ　they groｗ ｕp.
Ａ. Ｒiｇｈt　　 Ｂ.　Wroｎg C. Not menｔioned　
第3部分:概括大意与完毕句子(第２3~30题，每题１分,共8分)
下面旳短文后有２项测试任务：(1)第２3~26题规定从所给旳6个选项中为第2～5段每段选择1个最佳标题；（2)第２7~30题规定从所给旳6个选项中为每个句子确定1个最佳选项。
ＬED　Liｇhtinｇ
　Ａn　accｉｄentａｌ discｏvery　annｏunced recently has taken　LED lightiｎg　ｔo ａ ｎew ｌｅvｅl，　suggｅsting iｔ could　soon oｆfeｒ a ｃheaper,　lｏngｅr-laｓtinｇ　altｅrnatｉvｅ to　the　ｔraditioｎal ｌigｈt ｂulb．　Tｈe ｂreａkthrough adds to a gｒowing trend that ｉｓ　likeｌｙ　tｏ evenｔuａlly maｋe　Thomaｓ　Ediｓon’s brighｔ　inｖｅntiｏn1　obｓolｅte. LEＤs　arｅ aｌｒeady usｅd in tｒafｆiｃ　ｌigｈts, fｌaｓhlightｓ, ａnd architectｕｒal lｉghｔｉng．　Ｔhey　aｒｅ flｅｘiblｅ anｄ　opｅrate less expensｉvｅlｙ than tｒａditionａl ｌｉghtiｎｇ.　
　 Ｍichaeｌ Bowerｓ, ａ gradｕａｔe studenｔ at Vanderbｉlt Uｎiversity， wａs ｊusｔ ｔryinｇ to make realｌｙ smalｌ quａnｔum ｄｏts,　whiｃｈ are cｒyｓtaｌs gｅneｒally only a ｆｅw naｎoｍeters　big． Qｕanｔum doｔs contａin anywｈｅrｅ　from １0０ ｔo 1,００0 eleｃｔrｏns.　Thｅy’re　easｉly ｅxｃited bｕndleｓ of enｅrgy， and ｔhe sｍaller they are,　the ｍore eｘcitｅd they　ｇet． Ｅach dot　ｉn Bower’ｓ　parｔｉｃｕlaｒ batcｈ　ｗas excｅptionally ｓmall, containing　onｌｙ　3３　oｒ　３4 ｐairｓ of atoms.
　　　 Whｅn you sｈiｎe a lｉght　oｎ qｕａntum　dotｓ or　apply ｅlectrｉcitｙ tｏ tｈem, ｔｈey reaｃt by prｏducinｇ tｈeir ｏwn light， normally　a　briｇht, vｉbraｎt colｏr． Ｂut wｈｅn Ｂｏｗers shｉｎed a lａser ｏn his batcｈ ｏf dots, ｓomethｉｎｇ unexpeｃｔed　happeｎｅd. Hｅ ｗａs sｕｒｐrｉseｄ　whｅn a　wｈite ｇlow　coveｒｅｄ the taｂle.　The ｑuaｎtum dｏts　wｅre supｐｏsｅd to eｍit blｕe light4, but insｔeａd they wｅre　giving ｏff a　ｂｅautifｕl　whｉte glｏw.
　 Theｎ Bｏwers aｎd ａnotheｒ　student ｇot　ｔhe ｉｄｅa　tｏ　stiｒ ｔｈe　dots inｔｏ polyurethａne and coaｔ ａ bｌｕｅ LED ｌｉｇｈt bulb with　thｅ　miｘ．　Thｅ　lumpy ｂulb ｗasn’t prｅttｙ, but it produced　wｈitｅ　lｉｇht　siｍilａr to　ａ ｒegular ligｈt bｕlb.
　LEDs　producｅ tｗｉce aｓ ｍuｃh ligｈt　aｓ ａ ｒｅｇular　６0 wａｔt bulb aｎd burn fｏr ｏver　50.００0 houｒs.　Ｔhｅ Ｄepａrｔmｅnt
of Ｅnerｇy　ｅstiｍaｔes LＥD lightinｇ coｕld reｄuｃe　U.　S． ｅneｒgy ｃonｓuｍptiｏn　for　ligｈtiｎg　by　2９ pｅrｃent　bｙ 2０２５. LEDs don’ｔ　eｍit hｅat,　so　they’rｅ alｓo moｒｅ ｅneｒgy effｉcient. Anｄ ｔｈｅｙ’re ｍuch ｈarｄｅr to ｂreak．
Ｑuanｔuｍ doｔ mｉxｔｕｒes cｏuld be painteｄ　oｎ juｓt about anyｔhing and　eｌeｃtｒically eｘcitｅd tｏ　prｏduｃe ａ　ｒａinbow　of coｌors t inclｕding whｉｔｅ.　Ｔhe main　lｉght　soｕrce of thｅ ｆuture　will almosｔ sｕrelｙ ｎot be ａ bｕｌb． It mｉght be a tabｌｅ，　a　wall, ｏr even　ａ fork.　
2３.　Paragｒaph 1 　 　
24. Paragrａpｈ 3 　
25． Paraｇraph ５　　　 　
26. Paraｇｒaph 6
　 Ａ. ＬＥD Ｌiｇhｔiｎg Is Ｎot Maturｅ
　　 　B. LED Ｌiｇhtinｇ　Will Reｐｌａｃe Tｒaditiｏnal　Ｌｉghtiｎg
　　　 Ｃ. Aｌmost　Eｖerything　Couｌｄ　Be thｅ Main Liｇhｔ Source iｎ　ｔhe Ｆｕｔurｅ
　　 D. LED Lｉgｈtinｇ Has　Ｍany Aｄvantａges
　 E. Ｂowｅrs Ｍade an Uｎexpｅcｔed Discoverｙ
　 F．　ＬED　Light Bulbs Look Ｌｕmpy
27．　Unliｋe ｔraditiｏnal lightiｎg， LＥＤｓ ｄo　ｎot gｉvｅ　ouｔ heat so　 　.
28. Edｉson’ｓ bｒｉｇht ｉnvention is　likely to　ｂe outｄatｅｄ bｅcause 　 .
2９. Somethiｎg　unexpecｔed haｐpened durｉnｇ Ｂｏwer’s experｉmenｔ when ．
30.　Oｖer　one quａrtｅｒ ｏｆ eｎeｒgy coｎsumptioｎ foｒ ｌighｔing could　be saved　by　2０25　ｉｆ 　 .
A. ｔｒaditional liｇhting　is lｅss　durabｌe　aｎｄ deareｒ
B． ａ　ｌaseｒ excｉｔed ｔｈｅ　qｕanｔｕm dots
C.　Amｅｒica aｄoｐteｄ LＥDs　
D．　ｇradｕaｔe studeｎts ｗork hard
E.　quａntuｍ dot mixtures ａrｅ magic
F. ｉｔ is more eｆficiｅnt
第4部分：阅读理解(第3１～45题，每题3分，共4５分)
　　下面有３篇短文，每篇短文后有５道题。请根据短文内容,为每题确定１个最佳选项。
第一篇
Ｅat to Live
A　mｅager ｄｉet ｍay ｇｉve　you　heaｌth ａnｄ long　lｉｆｅ, but ｉt’ｓ not ｍuｃh ｆuｎ　—　ａnd it　mｉgｈt noｔ　eｖeｎ　bｅ neｃessａry. We ｍaｙ be able ｔo　hang on to mｏst of thａt yｏｕtｈfuｌ ｖｉgｏr even if ｗe doｎ’t start to　ｄiｅｔ until ｏｌd agｅ.
Sｔephen Ｓpinｄler and hｉｓ colleagues froｍ thｅ　Univｅrsity ｏf Ｃalifornｉa at Riveｒside have fouｎd　ｔhat ｓｏｍe oｆ an eldｅrｌy mouse’s liver genes ｃａn hｅ　ｍadｅ to behave　aｓ theｙ diｄ wｈen ｔhe mouse　was yoｕｎg　simｐｌy by　limiｔinｇ its foｏd for　four ｗeeks. The ｇenetic rejuｖenaｔion　won’t reverse oｔhｅr dａmａge caｕsed by timｅ ｆｏr the mouｓｅ, but cｏuld help its liｖeｒ　ｍｅtabolize ｄruｇs ｏr get ｒiｄ　of ｔoxins.
Spindlers teａm　fed ｔhｒee mｉcｅ　a　nｏrmal diｅt ｆｏｒ ｔheiｒ　ｗholｅ lｉｖes， and ｆed anotheｒ　three on half-ｒatｉons. Thrｅe ｍｏｒｅ mｉｃｅ ｗeｒe ｓwｉtched from ｔhe ｎormａl　diet ｔｏ haｌf-feed　for a ｍoｎth ｗhｅn they　ｗerｅ 34 months oｌd　— equｉvalent to aｂoｕt ７0 huｍan years.
Thｅ reseaｒcｈers checkeｄ the ａｃtivity　of 11,　00０ ｇenes　ｆrｏm ｔhｅ　ｍｏuse ｌiｖers， and fｏund tｈat ４6　ｃｈａngeｄ witｈ age in the　ｎormａlly　feｄ　mｉｃe.　Thｅ　chａnges weｒe ａssocｉaｔｅd ｗｉｔh thiｎgs　like inflaｍｍａｔioｎ　and free ｒadｉcal produｃｔｉｏｎ　—　probablｙ　bａｄ nｅws for　mｏuse healtｈ.　Ｉｎ tｈe miｃｅ　thａt hａd dieted nil　theｉｒ ｌiveｓ，　27 of tｈｏsｅ 46 genｅs contｉnｕed ｔｏ behａｖe ｌiｋe young genes． Buｔ　thｅ　mｏst suｒpriｓiｎg　finding was thaｔ thｅ miｃe that　onlｙ ｓtａrted　dieting iｎ　old age　ａlｓo bｅnefitｅd ｆrｏm ７0 ｐer cenｔ ｏf ｔhese gene chaｎｇes.
“Thｉs iｓ　the firｓt　ｉｎdｉcation　that ｔhese　effects kｉcｋ in pｒetty quickly.” ｓａｙ　Hubｅr Wａｒner frｏm　ｔhe Naｔｉonaｌ Institｕte　on Ａging　neａr Waｓhｉｎgton D. Ｃ.
Ｎo ｏnｅ yet ｋnows iｆ　cａloｒｉｅ　restriｃtion worｋs　ｉｎ ｐeｏple　ａs　it doｅs　ｉn micｅ, ｂut Spinｄｌｅr　ｉｓ ｈｏｐeｆuｌ.　“Theｒe’s atｔracting and tｅmpｔing evidence out　ｔheｒｅ ｔhａt ｉt will　wｏrk,” ｈｅ　sａys.
Ｉｆ it does　wｏｒk in　ｐeople, thｅｒe might be gｏoｄ reａsonｓ fｏｒ ｒejｕｖｅｎatｉｎg the ｌiver．　As we　get olｄer, ｏur boｄieｓ ａre　lｅｓs efficｉｅnt ａt　ｍetabolｉzｉng dｒugs, ｆｏr exａｍple． Ａ bｒief　periｏｄ　ｏf　tiｍe oｆ diｅting,　sａyｓ Spｉnｄler, could bｅ enougｈ　to maｋe sｕre a drｕｇ　ｉs efｆectiｖｅ.
But Ｓpindlｅr ｉｓn’t sure ｔhe　ｔradｅ-off　iｓ　worｔh　it. “The　ｍｉcｅ ｇet　ｌess　dｉｓease, ｔｈey ｌive lonｇｅr, buｔ thｅy’rｅ　hｕngry，” hｅ　ｓaｙs, “Ｅｖen ｓeeing what a diet does　, it’s stｉｌｌ　hard　tｏ gｏ to ａ　ｒｅstaurａnt and　say： ‘I can only caｔ ｈａlf of thaｔ’．”
Spindlｅr　ｈopes we　soon　won’t ｎeeｄ　to　dieｔ at　aｌl． His cｏmpany， Lifespaｎ Geｎｅtics in California,　is ｌｏokｉｎｇ foｒ ｄrugｓ　that hａve thｅ efｆects ｏf cａｌｏric　resｔrｉction.
３１. Acｃｏrdiｎg to the　pａssａｇe, wｈich of　the folｌowinｇ is ＮＯＴ true?
A. Ｅaｔｉng less thaｎ　uｓuaｌ mｉght ｍaｋe　ｕs　live longer.
Ｂ. wｅ ｇo oｎ A　diet wheｎ ｏlｄ， we may keeｐ hｅａｌtｈy.
C. Diｅting mighｔ　ｎot ｂe　neeｄed.　
Ｄ． Wｅ haｖe tｏ begin diｅtinｇ siｎｃｅ ｃhｉldｈood．
32. Why dｏｅｓ the authｏｒ menｔion an eldｅrly　mouse iｎ　ｐａragraｐh　２?
A.　To　deｓｃribe tｈｅ influeｎce　or oｌd ａge oｎ ｍiｃe.
B.　To illuｓｔｒate　tｈe　ｅffeｃt　ｏf meager fooｄ on mｉce.
C． To tell uｓ　how ｍiｃe’s ｌiveｒ genes bｅhａvｅ.
D． Tｏ　infｏrｍ　uｓ　of ｔhe pｒoｃeｓｓ　of ｍeｔaｂolｉzinｇ drｕgs.　
33. Wｈaｔ cａn ｈe　infｅｒｒed　about compｌeｔely normaｌly feｄ mice ｍentioｎeｄ in thｅ　passaｇe?　
Ａ. They will　not eｘperｉeｎce ｆreｅ rａdical proｄuction.
B． Theｙ　ｗｉll ｅxperieｎcｅ ｍore geneｔiｃ　rｅｊuvｅnａtiｏn in their lifeｔime.
C． Theｙ　haｖe　moｒｅ oｌd　liver ｇenes tｏ　ｂehavｅ like　yｏuｎg　genes.　
Ｄ. They　are mｏre lｉｋely　tｏ suffer fｒｏm inflamｍａtion.
３4. Ａccording to　the autｈor， whiｃh of　thｅ following moｓt　ｉnｔｅrested thｅ rｅｓearchers？
A. Ｔhｅ　ｍｉcｅ tｈat　started　ｄieｔiｎｇ ｉn old age．　
B． 27 of those 46 ｏｌｄ genｅs　that coｎｔiｎued to ｂehaｖe like young geneｓ.
C. Caloｒie reｓtｒｉｃtioｎ thaｔ ｗorks ｉn　pｅople.
Ｄ． Dｉeting ｔｈaｔ mａkes ｓure　ａ ｄrｕg is　ｅｆfeｃｔivｅ.
35. Accordｉng　１０ ｔhe lａsｔ two parａgraphs, Sｐinｄler　belieｖｅs thaｔ
A. caloｒie rｅsｔrictｉｏｎ　is　vｅｒy impｏrtanｔ　to young ｐeoｐle.
B. sｅeing　tｈe　efｆeｃt of ａ dｉet, peｏｐle ｗill　likｅ tｏ　eaｔ less thａｎ normaｌ.
C. dietｉng is　ｎot a good meｔhod to ｇiｖe　ｕs ｈeaｌtｈ　anｄ ｌong lｉfe.　
D． druｇs　do ｎoｔ havｅ ｔhｅ ｅffecｔｓ of cａlorie rｅstrictｉｏｎ．
第二篇 　
　 　 　 　 　 　 　 Ｓｎｏｗfｌａkｅｓ
You’ve　ｐrｏbably heaｒｄ that no two sｎowfｌakeｓ　are alike． Ｏｆ couｒsｅ, nobodｙ hａｓ　ｅver ｃonｆirmed that ｓtatｅment　ｂy　exaｍining　everｙ one oｆ　thｅ　ｅstimated onｅ sｅｐtｉllion sｎowflakes ｔｈat ｄrift to　Ｅarth ｅａｃh yeａｒ. Still, Keｎｎeth　Libｂreｃht,　a profesｓor at the Ｃalifornia　Instiｔuｔe ｏf Ｔecｈnoloｇy, iｓ　confｉdｅnｔ thａt ｔhe statement is trｕe．
Snowflakes aren’t　flaky,　says Lｉｂbreｃht． At theｉr basic lｅvel, theｙ’re crｙstallｉne. The　lａttice ｏf ｅvery　snoｗfｌａkｅ　is ｓiｘ-ｓiｄｅd　ｉn shａpe. Ｔhe simpｌest ｓnow　cｒystａls　are siｘ-sided　ｆｌaｔ plateｓ　ａnd sｉｘ－ｓｉded ｃoｌumns． Such ｃrystals　aｒe　coｍｍon in plaｃes ｗhere the aｉr is exｔreｍely　cold　anｄ　dｒy. Snow　ｃｒｙsｔals acquire ｔｈeiｒ　sｐｅｃiａl beautｙ　when theiｒ ｓimple　siｘ-sideｄ ｓymmetry　bｌoｓｓoms. Undｅｒ thｅ rｉｇhｔ conditiｏｎｓ, ｅａcｈ ｏf thｅ six corｎeｒs ｏｆ a　crysｔal ｓpｒoｕts1 what is ｃａlｌed ａn arm． In a matteｒ oｆ ｍinｕｔes, the arms　caｎ bｅcoｍe higｈly ornate ａnd gｉvｅ the　crystal　ａ　stａｒ ｌikｅ appｅarance.　
Several ｆａctorｓ　ｉn tｈe environｍｅnt affecｔ the　shａｐe and　growtｈ ｒａｔｅ of a snow ｃrystaｌ. Ｏnｅ　fａctｏｒ is　hｕmiditｙ. Cｒystａls grｏw　fasｔer and ｉn mｏre ｉｎｔｒｉcate shapｅ as humｉｄity iｎcreａｓes． A　sｅcｏnｄ faｃtoｒ　is ａir tempｅrａturｅ．　Ａ snｏwflake ｉs ｂorｎ when ｓevｅｒal mｏlｅcｕｌes　oｆ ｗaｔer vapoｒ ｉn a ｃloud lａnd on a speck of　ｄuｓｔ　anｄ ｆrｅezｅ tｏ form ａ simple cryｓtａl. As the ｙoung cryｓtal　bｏps　aｒound ｉn the cloｕd, it paｓsｅs tｈrouｇｈ aiｒ　ｐｏckeｔｓ of varyｉng tempeｒatuｒes.　Iｆ thｅ crystaｌ ｐaｓses thｒouｇh a　pｏcｋet of aiｒ　thａt ｉs， sａy, －１５ ｄegreeｓ　Ceｌsiｕs， iｔ ｗill gｒoｗ　quicｋlｙ anｄ sproｕｔ　sｉx ａrms　ｓａｙs　Lｉbｂrecht. If　ｔhe cryｓｔal is　then toｓsｅｄ intｏ　a waｒmer ｐocｋet, one　aｂoｕｔ　-10０C, ｔhe arｍs　tips wｉlｌ stoｐ gｒowiｎg ｑｕｉcklｙ anｄ form six-sided platｅｓ． If the ｃryｓｔal ｔｈeｎ drifts into aｎ even　warｍer pocket of aｂout -50C，　itｓ ｔop and bottom wｉlｌ grow　morｅ ｑuickly tｈaｎ ｉts sides and become morｅ coｌuｍn　lｉｋe　in shape．
In ｔhe course of　its life ｓｐａｎ, a snow-cｒystal　ｍiｇht fｌｕｔtｅｒ ｔhｒough ｍａny ｗaｒｍｅr anｄ colder pocｋｅts, aｃquiriｎｇ a　comｐlicatｅd ａnd uniquｅ ｇrｏwｔh ｈistｏry. Such a history wilｌ givｅ　rｉse ｔo ａ snoｗｆlake thaｔ iｓ uｎｌike　ａny othｅｒ. Eａｃh　arm on the sｎowflakｅ wｉll　look exactly ｌike eｖery other oｎｅ， but ｔｈe ｃｒystal itsｅlf will　bｅ one of a ｋind．
Uｓing　ｈｉｓ ｃoｏlinｇ tanks， Libｂｒecht hａs　lｅａrned how tｏ ｃreate sｎow ｃrｙsｔals ｏf　difｆerｅｎt ｓhapes -　plａtes,　ｃｏlｕmns,　neeｄleｓ, etｃ. Lｉbｂrecｈt　ｈａｓ　eveｎ ｒefineｄ his tecｈniqｕeｓ so thａt he ｃan make cｒyｓtａls tｈat　ｌｏok higｈｌy ｓimｉlar　tｏ oｎｅ　ａnother. Still, he laｃks　tｈe cｏntｒｏl to