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
Salt is as necessary to life as water. In many areas of Africa people once drank the urine (尿) of animals because they had no ot
Salt is as necessary to life as water. In many areas of Africa people once drank the urine (尿) of animals because they had no ot
admin
2011-01-14
32
问题
Salt is as necessary to life as water. In many areas of Africa people once drank the urine (尿) of animals because they had no other source of salt. Without salt, human beings die.
The human body demands that the amount of salt in the blood always stay the same.When the body does not get enough salt, it protects itself by letting less salt leave the body in urine and sweat. But it cannot reduce this output to zero. Some salt is always escaping. On a completely saltless diet, like that of some people in Africa, the body steadily loses small amounts of salt through the kidneys (肾) and sweat glands (腺). It then tries to ad-just to this loss by speeding up its secretion (分泌) of water.
In this way, the body attempts to keep the amount of salt in the blood at the necessary level. The result is a slow drying up of body and, finally, death. The person dies of thirst.
In cases where there is little or no water to drink, the body tries to do the opposite thing. Again, it must keep the salt level in the blood constant. Because it has little water, it attempts to stop water from leaving the body and to increase its secretion of salt. But, as with the escaping salt, it cannot be completely successful. Some water still leaves and the person eventually dies of thirst. In short, the body’s normal needs for salt and for water are both parts of the same important need to keep the salt level in the blood constant.
In order to adjust to the loss of salt, the body______.
选项
A、loses some blood
B、speeds up its secretion of water
C、speeds up its secretion of salt
D、is drying up slowly
答案
B
解析
文章第二段提到了这句:It then tries to adj ust to this loss by speeding up its secretion(分泌)of water.因此应该选B。
转载请注明原文地址:https://kaotiyun.com/show/2DJO777K
0
成人本科学位英语
相关试题推荐
Duringrecentyearswehaveheardmuchabout"race":howthisracedoescertainthingsandthatracebelievescertainthingsand
IsitthesoleaimofmostAmericanstomakemoneyandpossessluxurieswhichcouldbecalledexcessive?ThemajorityofAmerica
Itisdifficulttoimaginewhatlifewouldbelikewithoutmemory.Themeaningsofthousandsofeverydayperceptions,thebases【
Despiteacoolingoftheeconomy,hightechnologycompaniesarestillcryingoutforskilledworkers.TheInformationTechnology
Therearethreetrendsmostwidelyblamedforcausingenvironmentalproblems—populationgrowth,urbanizationandindustrializati
Theyalwayslayinalarge______oftinnedfoodinwinterincasetheyaresnowedup.
Whethertheeyesare"thewindowsofthesoul"isdebatable!thattheyareintenselyimportantininterpersonalcommunicationis
NancyJeschke’ssleepingdifficultiesbeganonvacationafewsummersago.Sheblamedthenoisymotelroom,buthersleepingdid
Whenshe(came)backfromHollywood,shewanted(totell)everybody(about)allthestarsandexcitingpeople(who)shehadseen
知道会议结束那位经理一直保持沉默不语。
随机试题
A、宋内志贺菌B、福氏志贺菌C、鲍氏志贺菌D、痢疾志贺菌E、空肠弯曲菌欧美国家优势菌型:()
带下过多的治疗原则是()。
腰椎问盘突出症患者围术期功能锻炼方法,错误的是
建筑场地较小时,采用建筑基线作为平面控制,其基线点数不应少于()个。
金融市场的微观经济功能有()。
下面是某求助者MMPI-2的测验结果:对于采用0一4评分的SCL一一90量表,筛查阳性的总分分界值是()。
稀土有“工业维生素”的美称,广泛应用于军事、石化、轻纺、农业等多个领域。下列关于稀土的说法中不正确的是()。
TherearemorethanfortyuniversitiesinBritain—nearlytwiceasmanyasin1960.Duringthe1960seightcompletelynewoneswe
Weallknowthatitispossibleforordinarypeopletomaketheirhomesontheequator,althoughoftentheymayfeeluncomfortab
Inthefaceofunexpecteddifficulties,hedemonstratedatalentforquick,______action.
最新回复
(
0
)