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 othe
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 othe
admin
2014-07-25
56
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.
What does the word "constant"(Line 2, Para. 3)mean in the passage?
选项
A、The same.
B、Amount.
C、Going up and down.
D、Changing.
答案
A
解析
语义判断题。此空与动词keep构成系表结构,应为形容词成分,排除B选项。C、D选项同义,可排除。根据句意,血液中的盐分含量应保持恒定,选A。
转载请注明原文地址:https://kaotiyun.com/show/S1xO777K
0
成人本科学位英语
相关试题推荐
Shebecame(angrier)astheyearswent(on)becauseshesaw(that)theyweredoingto(other)youngsters.
Throughoutthecolonialperiodtherewasaremarkableshortageofwomen,whichvariedwiththeregionsandwasalwaysgreatesti
______canbejudgedfromhereyes,shehasnopersonalhostilitytous.
Itisnecessarythatanefficientworker______hisworkontime.
Encouragementthroughpraiseisthemosteffectivemethodofgettingpeople______theirbest.
______youobjecttoaman,everythinghedoesiswrong.
Theboywoulddoeverythingbut______hisfault.
Ourcountryhasmanychancesforadultswhowanttomaketheirlivesbetter.Therearepublicschoolsyoucanattend.Inthesch
Ourcountryhasmanychancesforadultswhowanttomaketheirlivesbetter.Therearepublicschoolsyoucanattend.Inthesch
随机试题
语言学习包括两种情况:第一语言学习,即_______;第二语言学习,即外语学习。
患者,男性,75岁。确诊COPD已10多年,本次因COPD急性加重2天急诊入院。查血气分析(刚吸氧约15分钟)示:pH7.32,PaO249mmHg,PaCO272mmHg,AB35mmol/L,BE+16mmol/L。患者的血气分析属于下列哪种类型
患者。女,29岁,已婚。剖宫产后15天,小腹隐痛,喜按。恶露量少色淡,头晕眼花。舌淡,苔白,脉虚细。其治法是
依照对医疗机构执业要求的规定,医疗机构有以下义务,除了
根据《关于加强含麻黄碱类复方制剂管理有关事宜的通知》(国食药监办(2012)260号),药品零售企业销售含麻黄碱类复方制剂时应()。
患者男,60岁,诊断为慢性喘息性支气管炎伴肺气肿,血气分析示PaO255mmHg,PaCO280mmng,pH7.31,BE+4,说明患者并发有()
工程勘察报告《工程地质剖面图》中应包括:岸线方向、主要地貌单元、地层的分布、建筑物轮廓线等确定的剖面位置,及纵横工程地质剖面图,图上画有该剖面的()等。
帕累托最优的必要条件是()。[2008年真题]
CRM对企业的作用不包括()。
MM定理
最新回复
(
0
)