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
专升本
Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,0
Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,0
admin
2012-11-20
50
问题
Light travels at a speed which is about a million times faster than the speed of sound. In one second, light travels about 300,000km. But sound travels only 344m. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke comes from his gun before the sound reaches your ears.
This great speed of light gives us some strange facts. Sunlight takes about 8 minutes to reach us. If you look at the light of the moon tonight, remember that the light left the moon 1.3 seconds before it reached you. The nearest star is so far away that the light which you can see from it tonight started to travel towards you four years ago at a speed of nearly 2 million km per minute. In some case, the light from one of tonight’s stars started on its journey to you before you were bola.
Thus, if you want to be honest, you cant say" The stars are shining to night"? You have to say "The stars look pretty. They were shining four years ago but their light has just reached Earth".
If the information give in this passage is correct, when we look at a star at night ______.
选项
A、we will notice that it is not moving
B、we cannot tell whether or not it still exists
C、it will be brighter than the moon
D、it is four years that the light we can see will reach us
答案
B
解析
转载请注明原文地址:https://kaotiyun.com/show/VGeC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Overayearago,JamelBalhi,aFrenchyoungadventurer,madeapromiseinParistohisChinesefriendfromShanghaihewould【21
______issheinLondonthansheringsupheroldfriendMary.
Pickouttheappropriateexpressionsfromtheeightchoicesbelowandcompletethefollowingdialoguebyblackeningthecorrespo
Pickouttheappropriateexpressionsfromtheeightchoicesbelowandcompletethefollowingdialoguebyblackeningthecorrespo
Itwasalmosttwoo’clock.Acoldwindhadcomeup,overthelake.Asablackcloudmovedacrossthesun,Walt,asmallboy,lo
Theworlditselfisbecomingmuchsmallerbyusingmodemtrafficandmodemcommunicationmeans.Lifetodayismucheasierthani
Atonetimeoranotherwehaveallstoppedtothinkabouttheweather.Somedaystheweatherisgood.Somedaystheweatherisb
Ourboatfloatedon(漂流),betweenwallsofforesttoothicktoallowusaviewofthelandwewerepassing【21】thoughweknewfro
YourPublicAffairsStudiesCoursesrequiresthatyouunderstandamajorinvestigationofanytopicofinterestanditalsorequ
Thefirstandsmallestunitthatcanbediscussedinrelationtolanguageistheword.Inspeaking,thechoiceofwordsis【21】th
随机试题
中华人民共和国成立前,老舍以小说创作为主;中华人民共和国成立后,以戏剧创作为主。()
患者,男,50岁。患有糖尿病,今日体温39℃,食欲减退,恶心、呕吐及腹痛,护理查体:嗜睡状态,呼吸加深加快,呼气有烂苹果味,皮肤干燥,考虑可能是合并
标准误的意义是
反映价格水平变动对居民生活费用的实际影响的指数是()。
通过英语学习,学生应理解外国文化,加深对祖国文化的理解,进而拓展文化视野,形成跨文化交际意识和初步的跨文化交际能力。
牛顿在科学上的贡献是多方面的,最重要的是()。
肌萎缩侧索硬化症(ALS),俗称“渐冻症”。某科研团队研究发现,ALS的疾病发展与肠道微生物AM菌的数量密切相关。研究人员观察和比较了37名ALS患者及29名健康亲属的肠道菌群和血液、脑脊液样本。他们发现肠道细菌菌株有差异,其中有一种菌株与烟酰胺的产生有关
函数fun的功能是进行数字字符转换。若形参ch中是数字字符’0’~’9’,则’0’转换成’9’,’1’转换成’8’,’2’转换成’7’,……,’9’转换成’0’;若是其他字符则保持不变;并将转换后的结果作为函数值返回。请在程序的下划线处填入正确的
窗口事件是指操作窗口时所引发的事件。下列事件中,不属于窗口事件的是
Peoplecouldeatmorecocoa-richproductssuchasdarkchocolatebutnotdrinkteaiftheywanttolowertheirbloodpressure,G
最新回复
(
0
)