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、A place for making astronomical observations. B、An instrument used for observing stars. C、A unit of measurement. D、The North S
A、A place for making astronomical observations. B、An instrument used for observing stars. C、A unit of measurement. D、The North S
admin
2017-02-13
26
问题
In ancient times, many people believed the earth was a flat disc. Well over 2,000 years ago, the ancient Greek philosophers were able to put forward two good arguments proving that it was not. Direct observations of heavenly bodies was the basis of both these arguments. First, the Greeks knew that during eclipses of the moon, the earth was between the sun and the moon, and they saw that during these eclipses, the earth’s shadow on the moon was always round, they realized that this could be true only if the earth was spherical. If the earth were a flat disc, then its shadow during eclipses would not be a perfect circle, it would be stretched out into a long ellipse. The second argument was based on what the Greeks saw during their travels. They noticed that the North Star, or Polaris, appeared lower in the sky when they traveled south, in more northernly regions, the North Star appeared to them to be much higher in the sky. By the way, it was also from this difference in the apparent position of the North Star that the Greeks first calculate the approximate distance around the circumference of the earth, a figure recorded in ancient documents says 400,000 stadia, that’s the plural of the world stadium. Today, it’s not known exactly what length one stadium represents, but let’s say it was about 200 meters. It’s a very good estimate for those writing so long before even the first telescope was invented.
Questions 19 and 21 are based on the passage you have just heard.
19. According to the speaker, what were the beliefs of the Greek philosophers based upon?
20. What does the speaker say about ancient Greeks who traveled south?
21. What does the term stadium refer to?
选项
A、A place for making astronomical observations.
B、An instrument used for observing stars.
C、A unit of measurement.
D、The North Star.
答案
C
解析
语义理解题。根据北极星位置的明显不同,希腊人第一次估算出了地球的周长。根据古代的文献记载,地球周长大约为40万“视距”,“视距”是大型露天体育场的复数形式。今天,一般的体育场的周长一般是200米。在第一台天文望远镜还没有发明的时候,希腊人的这个估算还是非常准确的。故选项C为正确答案,即stadium是一个古代希腊的度量单位。
转载请注明原文地址:https://kaotiyun.com/show/XWi7777K
0
大学英语四级
相关试题推荐
A、ThewomancanchangeAmericandollarsintoRMBatanybank.B、ThewomancanchangemoneyatthebanknexttothePeaceHotel.
NewYear’sresolutionsoftenhavetodowitheatingmorehealthfully,goingtothegymmore,losingweight—alladmirablegoalsa
A、Authoritiesshouldtakeactionstoprotectkids.B、Schoolbusaccidentsshouldbeavoided.C、Moreattentionshouldbegivento
A、Workpartners.B、Bossandsecretary.C、Husbandandwife.D、Teacherandstudent.D校园生活类,语义理解题。女士责备男士找借口,男士承认自己撒谎,并解释原因是他听不懂女士在课
A、Jacksurvivedtheaccident.B、Jackwastheonlyvictimoftheaccident.C、Jacksavedalltheotherpassengers.D、Jackhadlitt
It’sdifficulttoimaginetheseaeverrunningoutoffish.It’ssovast,sodeep,somysterious.【B1】______,it’snotbottomles
Althougheachbabyhasanindividualscheduleofdevelopment,generalpatternsofgrowthhavebeenobservedThreeperiodsofdev
Althougheachbabyhasanindividualscheduleofdevelopment,generalpatternsofgrowthhavebeenobservedThreeperiodsofdev
随机试题
关于主支气管的正确说法是:
下列选项中属于宾语前置句式的是()
男性,加岁,被刀刺伤,被诊为开放性气胸。现场急救措施首先为
甲向乙借款10万元,由丙作为保证人,约定“如果甲到期不能偿还该债务,由丙承担保证责任,直至甲的债务本息还清为止”。下列哪些选项是正确的?()
下列各项中,适用增值税出口退税“先征后退”办法的是()。(2009年新制度)
小小、豆豆、丁丁一起玩耍,豆豆和丁丁一起把一个玩偶放到了抽屉里,然后丁丁就跑出去玩了,豆豆偷偷把玩偶从抽屉里拿出来,藏到了衣柜里,小小在旁边看到了整个过程。处于前运算阶段的.小小会认为,丁丁从外面回来后会()找玩具。
创新人才大都不是在课堂里教出来的,而是在充满人文情怀和自由学风的环境里______出来的。当前中国大学教育______的关键在于开设能够改变思维方式和世界观的通识课程,而不是______的实用课程。要重视“无用知识的有用性”,也就是庄子所说的“无用之用”。
Smoking,whichmaybeapleasureforsomepeople,isaserioussourceofdiscomfortfortheirfellows.Medicalauthoritiesexpre
设f(x)=,则∫0xf(x)dx=________.
在中国,交通安全是一个难题。据公安部(theMinistryofPublicSecurity)统计,去年有6.2万人死于交通事故。最近出台的新交规(newtrafficregulations)正是改善交通安全的最新举措。新修订的交规大大加重了对
最新回复
(
0
)