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
It is an everyday observation that animals are born, grow, and mature, then begin to lose some of their capabilities, and finall
It is an everyday observation that animals are born, grow, and mature, then begin to lose some of their capabilities, and finall
admin
2013-11-29
58
问题
It is an everyday observation that animals are born, grow, and mature, then begin to lose some of their capabilities, and finally die. This loss of capabilities is progressive, irreversible and common for all members of a species and is called aging. In humans it shows in many ways, some very visible: decline in height, shrinkage of muscle, thinning and graying of hair, and wrinkling of skin. Internally, and even more significantly, there is the progressive loss of cells in the brain, kidneys, and other vital organs. This cell loss has resulted in stoppage of a vital process. Whatever the reason, important tissues ranging from the muscles to the brain shrink and become less competent with age. Many of these changes are reflected in functional decline. Not only do nerve cells at levels from the brain to the spinal cord diminish, but also those that remain conduct impulses at a slower rate so that the reaction time of the older animal is slowed. Memory often shows a decline.
Another widespread decline is in the loss of cells involved in the hearing process. The loss is most masked for high pitches and may require tile assistance of a battery-operated hearing aid. More subtle are such declines as those in the processes involved with being immune to disease, which result in a lessoned ability of the older organism to cope with infection. Indeed, pneumonia is one of the most common causes of death among the elderly population of most nations.
Mixed with true aging processes are disease processes that may be so common as to be mistaken for aging. For instance, the buildup of deposits of fatty materials in arteries tends to be progressive with aging; everything else being equal, the narrowing of arteries results in such serious illnesses as stroke or heart attack, occurring with increasing frequency as an individual ages.
It is now recognized that arteriosclerosis is the result of many factors, not only genetic but also environmental high blood pressure, high saturated-fat diets, and smoking, the effects of which be come more obvious with the passage of time. It is therefore an age-related, but not a universal aging, process and can thus usually be controlled.
As far as aging is concerned ______.
选项
A、the changes inside human bodies are more important than exterior ones
B、the loss of competence is more significant than that of cells
C、the shrinkage of muscles is more significant than the decline in height
D、the thinning of hair is less important than the wrinkling of skin
答案
A
解析
第一段先讲了随着年龄的增长,人类的外在变化,接着又指出Internally,and even more significantly,...loss of cells...可以判断选项A正确。
转载请注明原文地址:https://www.kaotiyun.com/show/o5hO777K
0
考博英语
相关试题推荐
Eachyear,millionsofpeopleinBangladeshdrinkgroundwaterthathasbeenpollutedbynaturallyhighlevelsofarsenicpoison.
ThehistoryofAfrican—Americansduringthepast4-00yearsistraditionallynarrated【1】anongoingstruggleagainst【2】andindiff
OneyearagowestaredaghastatimagesoftheSoutheastAsiantsunami.Videocamerastakenonvacationtorecordtheeverydayp
BeforehighschoolteacherKimberlyRughgotdowntobusinessatthestartofarecentschoolweek,shejokedwithherstudents
Thestudyshowsthatlayingtoomuchemphasisonexamsislikelyto______students’enthusiasminlearningEnglish.
Itisallverywelltoblametrafficjams,thecostofpetrolandthequickpaceofmodernlife,butmannersontheroadsarebe
Ateacherissomeonewhocommunicatesinformationorskillsothatsomeoneelsemaylearn.Parentsarethe【51】teachers.Justby
ThevictimsofdrunkendrivinginAmericaoverthepastdecade______anincredible250,000,withthreekilledeveryhourofeve
Readingtooneselfisamodernactivitythatwasalmostunknowntothescholarsoftheclassicalandmedievalworlds,whileduri
WhenIwasakid,Ineverknewwhatmyparents-oranyoneelse’s-didforaliving.AsfarasIcouldtell,allgrownupshadmyste
随机试题
下列哪些说法是正确的?
IEEE802.11协议是无线以太网的标准,采用【】
十二指肠溃疡患者可能有的体征是
患者咳嗽。查体:右上肺叩诊出现鼓音,并闻及支气管呼吸音和湿啰音。应首先考虑的是
对肠道寄生虫具有神经肌肉阻滞作用,使蛔虫产生痉挛性麻痹的是()。
2009年7月6日,某建筑公司的司机将自己所驾驶的该建筑公司运送沥青混凝土的运输车开进了施工现场附近的一条小河里进行清洗,该行为()。
创立大会一般由()组成。
下列选项中,对“小李并非既懂英语又懂俄语”理解正确的一项是()。
可用来帮助学生将所学的知识以一种新的或有创造性的方式组合起来,形成一种新的关系的提问是()的提问。
Forcenturies,immigrantshavecometoAmericaseekingthepromiseoflife,liberty,andthepursuitofhappiness.Somecamefl
最新回复
(
0
)