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] 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
细节判断题。作者明确提出通过分泌水分而调节盐分缺少。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3376673.html
相关试题推荐
[originaltext]Aresomepeoplebornclever,andothersbornstupid?Oristh
[originaltext]Manypeoplesufferfromsomeformofextremeanxiety.Someex
[originaltext]Approximately90%ofpeopleintheworldarenaturallyright-
Canyourememberwhatyouateyesterday?Ifasked,mostpeoplewillbeable
Canyourememberwhatyouateyesterday?Ifasked,mostpeoplewillbeable
Canyourememberwhatyouateyesterday?Ifasked,mostpeoplewillbeable
Canyourememberwhatyouateyesterday?Ifasked,mostpeoplewillbeable
[originaltext]Peoplespendalotoftimeusingphonesandcomputers.Mucho
[originaltext]Peoplespendalotoftimeusingphonesandcomputers.Mucho
A、Thewordsofsomebusinesspeoplearejustrubbish.B、Hewhoneverlearnsfrom
随机试题
毛笔(brushpen)是中国传统的书写工具和绘画工具。中国人使用毛笔写字作画的历史已有数千年之久,历史上有秦代蒙恬造笔的传说。笔头(nib)多用动物
Mostofushaveformedanunrealisticpictureoflifeonadesertisland.We
1Aboutthetimethatschoolsandothersquitereasonablybecameinterest
[originaltext]AbeetleinvasionintheUnitedStateshaskilledatleasttw
侧重从公关的传播属性来理解公共关系的学者是A.雷克斯?哈罗 B.弗兰克·杰夫金
( )是指先计算各分项工程的实物工程量,后套用预算定额计算人工、材料、机械台班
下列选项中,不属于风淫证表现的是()。A.咽痒咳嗽 B.皮肤瘙痒 C.
教育心理学研究表明:新的学习需要可以通过两条途径来形成,即()。 A.直接
银行承兑汇票的承兑银行,应当按照票面金额向出票人收取()的手续费。A:千分之一
(2017年真题) 【背景资料】 某新建商用群体建设项目,地下二层地上八层,
最新回复
(
0
)