首页
登录
职称英语
Since the beginning of history, man has been attracted by the idea of living
Since the beginning of history, man has been attracted by the idea of living
游客
2025-03-06
10
管理
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. [br] The passage is mainly about______.
选项
A、the possibility of preserving human bodies by freezing
B、the practice of preserving food by freezing
C、the harmful effects of freezing
D、how to remove water from living cells
答案
A
解析
本题为中心主旨题。根据定位句,idea的内容live forever(长生不老)与A项(保存人类身体)最接近,故选A。
转载请注明原文地址:https://tihaiku.com/zcyy/3984945.html
相关试题推荐
Sincethebeginningofhistory,manhasbeenattractedbytheideaofliving
Sincethebeginningofhistory,manhasbeenattractedbytheideaofliving
Sincethebeginningofhistory,manhasbeenattractedbytheideaofliving
Sincethebeginningofhistory,manhasbeenattractedbytheideaofliving
LivinginthecentralAmericandeserthasitsproblems,______obtainingwateris
Longbusridesareliketelevisionshows.Theyhaveabeginning,amiddle,a
Longbusridesareliketelevisionshows.Theyhaveabeginning,amiddle,a
Whatdowemeanbyasatisfactorystandardofliving?Obviously,itmustinc
Whatdowemeanbyasatisfactorystandardofliving?Obviously,itmustinc
Whatdowemeanbyasatisfactorystandardofliving?Obviously,itmustinc
随机试题
Inthecanonicalwritingoftheculturalessentialists,languagehas
Internationalairlineshaverediscoveredthebusinesstravelers,themanor
"ResourcesandIndustrialisminCanada"Whilethemuch-anticipatedexpansion
下列属于五环三萜的人参皂苷为A.人参皂苷ReB.人参皂苷RfC.人参皂苷RcD.
某混凝土试块强度值不满足规范要求,但经法定检测单位对混凝土实体强度经过法定检测后
下列药物属静脉麻醉药的是A.恩氟烷 B.盐酸氯胺酮 C.盐酸布比卡因 D.
新的SF6气体中空气质量标准值()(A)大于0.03(B)不大于0.03
城市交通系统由三个子系统组成,下列()是正确的。A.城市道路、铁路、公路
中央型肺气肿是指( )。A.三、四级支气管和周围肺泡囊扩张 B.呼吸性细支气
甲将一套房屋抵押给乙,并办理了抵押登记。此后,甲未经乙同意,又将房屋出租给丙,租
最新回复
(
0
)