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
8
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. 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] Some African people once drank animal urine______.
选项
A、when they were going to die
B、because they were thirsty
C、because there was little salt
D、because they were short of water
答案
C
解析
细节判断题。由定位句可以看出,在非洲的许多地区,人们曾经饮用过动物的尿液是由于他们盐的来源很少。别的选项都不符合题意。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3376672.html
相关试题推荐
[originaltext] Mostpeopletakecoin-collectingeitherasahobbyorasakind
[originaltext] Mostpeopletakecoin-collectingeitherasahobbyorasakind
[originaltext] Three-fourthsoftheworldiscoveredwithwater.Butonlyabou
[originaltext] (1)BushfiresinsoutheasternAustraliahavekilled108peoplea
[originaltext] (1)BushfiresinsoutheasternAustraliahavekilled108peoplea
[originaltext]M:(8)WhenIsayIliveinSweden,peoplealwayswanttoknowab
[originaltext]M:(8)WhenIsayIliveinSweden,peoplealwayswanttoknowab
[originaltext] Thenumberonemistakepeoplemakethesedaysregardingeating
[originaltext] Thenumberonemistakepeoplemakethesedaysregardingeating
[originaltext] Thenumberonemistakepeoplemakethesedaysregardingeating
随机试题
[originaltext](22)ItisusuallyagreedthataGerman,KarlBenz,builtthe
承泄区与排水系统的连接,可分为畅排和顶托两种情况。在外水位长期高于内水位,蓄涝容
某市第一高级中学于2005年经市政府批准拨用土地98亩扩建学校,其中教学楼占用5
“拿破仑的铝碗”:法兰西皇帝拿破仑三世每次宴请宾客时,宾客用的是银碗,唯有他一人
Thechangeinthatvillagewasmiraculou
89、220kV及以上电压等级变压器拆装套管或进人后,应进行现场局部放电试验。
建筑内的电梯井等竖井应符合下列规定()。A.电梯井应独立设置,井内严禁敷设可燃
利用重置成本法对资产进行评估时,哪项损耗是由于外部环境变化引起的()。A:实体性
处方中外文缩写pc.代表()A.微克 B.必要时 C.临睡时 D.餐后
患儿,男,7岁,下前牙长出“双排牙”,经检查,前排牙松动Ⅰ度,后排牙位于牙列舌侧
最新回复
(
0
)