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
A、More muscles than average people. B、A strong will. C、Strength, fitness and endurance. D、A strong heart. C
A、More muscles than average people. B、A strong will. C、Strength, fitness and endurance. D、A strong heart. C
admin
2021-09-29
71
问题
A world champion body builder has no more muscles than does a 90-pound weakling. So what makes him so strong? What other qualities does he need?
Muscles are made of thousands of stringy fibers—a number that is fixed during childhood—which contract when doing work. Strength does not depend on the number of fibers but on the function of their thickness and how many of them contract simultaneously.
Exercise actually damages the muscles. During the recovery stage, the muscle fibers increase in size. Exercise also trains more muscle fibers to work at one time. If a muscle is weak or untrained, for example, only about 10% of its fibers will contract, whereas up to 90% of the fibers in a weight lifter’s bulky biceps will contract.
Aside from strength, two other ingredients go into making an athlete: fitness and endurance. Fitness is related to the condition of the heart. During exercise, there is an increase in the amount of blood returning to the heart from the muscles. A typical volume for a runner at rest is about 5 quarts a minute, compared with 30 quarts during a vigorous trial. This greater volume means more work for the heart—a muscular balloon that expands and contracts to take in blood and squeeze it out. Like any other muscles, the heart enlarges and gets stronger with routine exercise.
Endurance, or the length of time muscles can work, depends in part on how much fuel—in this case sugar—the muscles can store. A muscle that is continually exercised until it is exhausted of sugar tends to store more when it refuels at the next meal. And more sugar can translate into greater endurance the next time the muscle is put to the test.
Questions 12 to 15 are based on the passage you have just heard.
12.Why is a world champion body builder so strong?
13.What does an athlete need according to the passage?
14.How does the heart enlarge and get stronger?
15.What does endurance partly depend on?
选项
A、More muscles than average people.
B、A strong will.
C、Strength, fitness and endurance.
D、A strong heart.
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/cbx7777K
0
大学英语六级
相关试题推荐
GeneticEngineeringisaradicalandrapidlydevelopingtechnologythattouchesourlivesthroughitsapplicationinmedicine,f
Researchershavesuggestedthatone’semotionalintelligence(EQ)isagreaterindicatorofsuccessandsatisfactionthanhisinte
ItispossibleforstudentstoobtainadvanceddegreesinEnglishwhileknowinglittleornothingabouttraditionalscholarlyme
OnNovember16thanumberofwell-knownmusicianswereonhandtohelpmarkthelaunchofGoogle’snewonlinemusicservice.Al
A、Tocategorizedifferenttypesoflearners.B、Tofindoutwhatstudentsprefertolearn.C、Tounderstandthemechanismoftheh
A、Lossofworkers’personaldignity.B、Deprivationofworkers’creativity.C、Deteriorationofworkers’mentalhealth.D、Unequal
Anyveterannicotineaddictwilltestifythatfancypackagingplaysnoroleinthedecisiontokeepsmoking.So,itisargued,s
A、Becausesheisontheexecutivestaff.B、Becausesheisfamiliarwiththecompany.C、Becauseshehasknowledgeofmanagement.
A、Bymarkingdowntheunitprice.B、Byacceptingthepenaltyclauses.C、Byallowingmoretimefordelivery.D、Bypromisingbette
A、Classmates.B、Colleagues.C、Bossandsecretary.D、PRrepresentativeandclient.B录音提到,Jokn和Sue加入了一家成功的publicrelation公司。由此可知他们
随机试题
保证合同的当事人是()。
A.温药B.凉药C.血药D.气药E.寒药痢下白多者,应重用
在开发商与承包商之间的各种合同文件的履行过程中,有关工程的洽商、变更等书面文件,优先于合同通用条款。()
既有建筑物地基的压缩层内的土的平均含水量大于塑限含水量,纠倾宜采用()。
投资决策阶段,建设项目投资方案选择的重要依据之一是( )。
根据供应商分类模块法,可以将供应商划分为:重点商业型、伙伴型、商业型和优先型的供应商,供应商分类模块法是依据( )进行矩阵分析。
强强在记忆湖南省轮廓图时,将其当成一个尖鼻子的人头来记忆。他运用的学习策略是()。
我国的教育基本法律是()。
Notlongago,amysteriousChristmascarddroppedthroughourmailslot.TheenvelopewasaddressedtoamannamedRaoul,who,I
ReadthetextbelowabouttheDisneycompany.Inmostofthelines(34-45)thereisoneextraword.Itiseithergrammaticallyi
最新回复
(
0
)