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
38
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".
In the first sentence," about" it similar in meaning to ______.
选项
A、around
B、only
C、at least
D、nearly
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/AGeC777K
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
Ihaveboughttwoball-pens,______writeswell.
Itwasapitythatthegreatwriterdied______hisworksunfinished.
Nowadaysmostpeopledecidequite【61】whatkindofworktheywoulddo.WhenIwasatschool,wehadtochoose【62】whenwewerefif
ManyfamiliesintheUnitedStateshavealargerincomenowthaneverbefore,butpeoplearefindingitdifficulttomakeendsm
Theoldinthecountry______takengoodcareof.
Animportantbusinessmanwasaskedtogiveatwenty-minutespeechinanothercity.Hewastoobusytowriteithimself,soheas
WhenIbeganreadingCatch-22,IthoughtitwasafarcicalsatireonlifeintheUnitedStatesArmyAirForce.LaterIbelieved
Ourboatfloatedon(漂流),betweenwallsofforesttoothicktoallowusaviewofthelandwewerepassing【21】thoughweknewfro
Romansoldiersinsomeplacesbuiltlongrowsofsignaltowers.Whentheyhadamessagetosend,thesoldiersshouteditfromto
Firecanhelppeopleinmanyways.Butitcanbeverydangerous.Firecanheatwater,warmhouses,givelightandcook.Butfire
随机试题
中国共产党人第一篇反对教条主义的重要文献是()。
患者,女,35岁。主诉大便时阴道脱出一肿块3cm×3cm。检查发现,取膀胱截石位向下迸气时,可见阴道前壁膨出,宫颈外口在阴道口上方约2cm。宫体大小正常,后位,附件(-)。该病人合适的手术方法为
医生甲退休后,擅自为人看病2年多。某日,甲为乙治疗,需注射青霉素。乙自述以前曾注射过青霉素,甲便未做皮试就给乙注射青霉素,乙因青霉素过敏而死亡。关于本案,下列哪一选项是正确的?(2013年卷二18题)
某水电站建设项目为规划径流式7梯级开发电站中的第三级。该河流有国家级保护鱼类,其中有鲑科鱼类两种;河流两岸森林较为茂密,有国家二级保护植物和二级保护鸟类。工程土石方量1000万m3,需移民3000人,拟建设为引水式电站,大坝高130m,长3000m,坝址下
城市规划实施监督的内容不包括()。
设计无要求时,降水工作应持续到()施工完成。
Alittleboyinvitedhismothertoattendhisschool’sfirstteacher-parentmeeting.Tothelittleboy’s【C1】________,shesaids
地产市场的不完全竞争性是由土地的()决定的。
一些重要的程序语言(如C语言和Pascal语言)允许过程的递归调用。而实现递归调用中的存储分配通常用
Storytellingisanancientandhonoredart.Storytellersentertainedduringthelongdarkhoursbeforesleeparrivedafterthe
最新回复
(
0
)