首页
登录
职称英语
Salt is as necessary to life as water. In many areas of Africa people once d
Salt is as necessary to life as water. In many areas of Africa people once d
游客
2024-01-19
61
管理
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 adjust to this loss by speeding up its secretion (分泌) of water. (78)
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. [br] What is the main idea of the passage?
选项
A、Salt is very important.
B、If their blood salt level is not constant, human beings may die.
C、The amount of salt in the body is secreted.
D、People can die of thirst.
答案
B
解析
通过文章我们可以知道,文章讲述了盐和水对身体的必要性,但是重点是要保持血液中盐分的稳定。
转载请注明原文地址:https://tihaiku.com/zcyy/3376265.html
相关试题推荐
[originaltext] Atleast10peoplehavediedintheAmericanstateofTexasaft
[originaltext] Whilesomepeopleseemedtobeblessedwithbeautifulandexpre
[originaltext] Likelotsofpeople,IneverthoughtI’dbeateacherwhenIwa
[originaltext] About5000yearsago,theEgyptiansandotherpeopleintheNe
[originaltext] About5000yearsago,theEgyptiansandotherpeopleintheNe
[originaltext] (1)Anexplosioncausedbyfireworkskilledmorethan100people
[originaltext] Youngpeoplearebecomingmoreandmorenostalgic(怀旧的),which
[originaltext] Youngpeoplearebecomingmoreandmorenostalgic(怀旧的),which
[originaltext] Youngpeoplearebecomingmoreandmorenostalgic(怀旧的),which
[originaltext] Communitysupportedagriculturefarms,orCSAs,seekpeoplewho
随机试题
Bygivinghimelectricalshocktreatment,thedoctorhas_____apartialcureofh
[originaltext]Myfriend,EmmaDaniels,spentthesummerof1974travelingi
A.EdgewiseAppliance B.BeggAppliance
在提问策略与反馈策略上,专家型教师与新教师存在哪些不同
简述大学生心理健康教育的内容
患者,女,30岁。带下量多,色黄而稠,少腹隐痛,阴部瘙痒,舌苔黄腻,脉滑数。不应
患儿,1岁。阵发性痉挛性咳嗽1个半月,经治疗咳嗽减轻,已少痰,容易出汗,舌红苔少
金字塔形的企业集团是由()联结方式形成的。A.层层控股型 B.共同投资型 C
下列费用中,应计入经营成本的有() A.流动资金借款利息B.建设投资借
下列文件中,属于施工承包合同文件的是()。A.中标通知书 B.设计变更申
最新回复
(
0
)