首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Since the beginning of history, man has been attracted by the idea of living forever, of winning the fight against death and dis
Since the beginning of history, man has been attracted by the idea of living forever, of winning the fight against death and dis
admin
2022-10-01
54
问题
Since the beginning of history, man has been attracted by the idea of living forever, of winning the fight against death and disease. So far, this has only remained a dream, though a very powerful one. Many people have wondered whether it would be possible to find a way to preserve human bodies, and what would be the best way to preserve human bodies.
It has long been known that meat of fruit can be kept fresh for long periods by freezing; in ancient China, for example, food was stored with ice to keep it fresh. This method could also be useful for preserving humans, and in fact many people have explored this possibility.
However, most living beings that exist under warm conditions die when frozen. This is because of the harmful effects of freezing ice crystals (晶体), which are not only larger than the volume of the water originally in the cells, but also form sharp cutting shapes that harms the cells.
In the 1940s Dr B. J. Luyet and a group of scientists in England were working on the problem of freezing cells without damaging them. Since the harm caused by ice crystals was the main cause of the damage, Luyet suggested removing some or all of the water from the cells before freezing them.
Using living cells from chicken, Luyet and his assistants discovered that they could partly dry the chicken cells, using a mixture of the white part of an egg and glycerin(丙三醇), a clear, thick liquid made chiefly from fats and oils. Some success was obtained. The chicken cells were dried, frozen for a period of time, and then carefully unfrozen. Almost all the cells recovered when they reached normal temperatures.
Since then, the cooling of whole animals to a temperature very much below freezing point for later unfreezing has become more of a possibility, and the glycerin method would probably be used to accomplish this. When this can be done completely and successfully, science will have moved much closer to its aim of freezing and storing incurable patients until the day they can be cured.
Glycerin can be used________.
选项
A、to freeze living cells
B、to unfreeze living cells
C、to remove water from living cells
D、to change the shapes of crystals
答案
C
解析
第四段最后一句“Since the harm caused by ice crystals was the main cause of the damage, Luyet suggested removing some or all of the water from the cells before freezing them.”以及第五段倒数第二句“The chicken cells were dried, frozen for a period of time, and then carefully unfrozen.”。本题为细节题。根据定位句,冷冻前要进行脱水。鸡细胞在使用glycerin (甘油)之后,变干,然后被冷冻。由此可知glycerin(甘油)的作用是脱水。故选C。
转载请注明原文地址:https://kaotiyun.com/show/HbcD777K
0
成人本科学位英语
相关试题推荐
Writeanessaybasedonthefollowingchart.Inyourwriting,youshould1)describethechart,and2)giveyourcomments.Yous
Skepticsofhighereducationoftencomplainthatuniversitiesoffertoomanyboringdegreeswithlittlevalueintheworkplace.【
Scientistssentpatternsofelectricitycoursingacrosspeople’sbrains,coaxingtheirbrainstoseelettersthatweren’tthere.
Thinnerisn’talwaysbetter.Anumberofstudieshave【C1】________thatnormal-weightpeopleareinfactathigherriskofsomedi
Peoplehavespeculatedforcenturiesaboutafuturewithoutwork.Todayisnodifferent,withacademics,writers,andactivists
It’sdifficulttoimagineaworldwithoutantibiotics.Theycurediseasesthatkilledourancestorsincrowds,andenableanynu
Scientistshavediscoveredapowerfulantibioticinthebloodstreamofgiantpandasthatcandestroybacteria.TheChineserese
Bettingagainstanindustrywithaddictsforcustomerscarriesobviousrisks.【C1】________theseareuncertaintimesforBigTobac
Mr.Smithwantstobooktwosingleroomswith________,bothonthesamefloor.
Mr.Smithwantstobooktwosingleroomswith________,bothonthesamefloor.
随机试题
BettyandHaroldhavebeenmarriedforyears.Butonethingstillpuzzles(困扰)oldHarold.HowisitthathecanleaveBettyandh
13世纪法国出现的私人编纂的习惯法汇编是_______。
=_______.
发包人应按合同专用条款约定及时向承包人提供施工场地范围内地下管线和地下设施等有关资料,并保证资料的真实、准确、完整。承包人据此做出的判断、推论的后果应由()承担责任。
达美公司在全国各地拥有10多个仓储物流中心,还控制了多个中药材交易市场。基于此优势,达美公司决定构建一个中药材电子商务市场,并把它建成“实体市场与虚拟市场相结合”、中药材电子交易与结算服务为一体的中药材大宗交易平台。目前许多企业计划进入中药材电子商务业务。
关于违约责任的说法,错误的是()。
学习新知识之前给学生一个引导性学习材料是指()
义务教育的特点不包括()。
Completethesummaryusingthelistofwords/phrases,A-J,below.MeasurestoprotecttheoceansUptillthe
A、Oneyear.B、Sevenyears.C、Fouryears.D、Sixyears.D根据对话中“I’velivedhereforaboutsixyearsnow.”可以判断此题答案为D。
最新回复
(
0
)