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
26
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.
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
文章第一段提到In many areas of Africa people once drank the urine(尿)of animals because they had no other source of salt.由此句可以看出,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很少。别的选项都不符合题意。
转载请注明原文地址:https://kaotiyun.com/show/1DJO777K
0
成人本科学位英语
相关试题推荐
Woman:Iftheweatheristhishottomorrow,wemayaswellgiveuptheideaofplayingtennisintheafternoon.Man:Oh,Idon’t
Japan’soldimperialarmyneverwentintothefieldwithoutagroupof"comfortwomen"forthetroops.Manymaleofficeworkers
Man:Haveyourunupagainstanyproblemsingettingyourpassportrenewed?Woman:Ihaven’tstartedtheplanyet.Question:Wha
Theresearchscientistsoftenmeetwithproblems______newtypesofinstrumentfortheirsolution.
SpeakerA:Thatwasagreatdinner.Thanksalot.You’llhavetocometoourplacesometime.SpeakerB:______
Ifwomenaremercilesslyexploitedyearafteryear,theyhaveonlythemselvestoblame.Becausetheytrembleatthethoughtofb
Agreatdealoftheknowledgewehaveabouthouseholdgoods【C1】______largelyfromtheadvertisementsweread.Advertisementsin
CustomsofficersataLondonairportyesterdayfound$500000worthofdrugswhichwerebeingsmuggledintoBritaininboxesma
Wouldyoubekindenough______mehowtogototheoffice?
Whenshe(came)backfromHollywood,shewanted(totell)everybody(about)allthestarsandexcitingpeople(who)shehadseen
随机试题
王某、李某合伙经营一家餐厅,根据合伙协议,王某可代理李某与第三人签订合同。这种代理属于()
取麝香仁粉末少量,置手掌中,加水润湿,用手搓之能成团,再用手指轻揉,不应出现
乳痨初起的治疗法则是
在某公司破产案件中,债权人会议经出席会议的有表决权的债权人过半数通过,并且其所代表的债权额占无财产担保债权总额的60%,就若干事项形成决议。该决议所涉下列哪一事项不符合《破产法》的规定?(2012年试卷三第31题)
图5-71所示结构中二杆的材料相同,横截面面积分别为A和2A,以下四种答案中()是该结构的许用载荷。
212,424,234,446,658,()
如果你真的在自己的脑门上贴上了“剩女”这个标签,很有可能就会在潜意识里去做出符合这个标签所代表的思想和行为。例如:心理和情绪上觉得自己没有希望了,是个不值得人疼爱的女人,没有女人味,没有男人缘,没有竞争力,会日渐枯萎,会孤苦终老,会郁郁以终等等。并且还会在
在Linux中可以实现代理服务器功能的软件是(56)。
下面关于USB和IEEE-1394的叙述中,正确的是______。
Passage1
最新回复
(
0
)