首页
登录
职称英语
[originaltext] Light travels at a speed that is about a million times faster
[originaltext] Light travels at a speed that is about a million times faster
游客
2024-06-07
9
管理
问题
Light travels at a speed that is about a million times faster than the speed of sound. In one second, light travels about 300, 000 km, but sound travels only about 334 meters. 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 come from his gun before the sound reaches your ears.
This great speed of light produces 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 rays left the moon 1.3 seconds before they reached you. The nearest star is so far away that the light that you can see from it tonight started to travel towards you about four years ago at a speed of nearly 20 million km per minute. In some cases, the light from one of tonight’s stars started on its journey to you before you were born. Thus, if we want to be honest, we cannot say, "the stars are shining tonight.” We have to say, "the tars look pretty. They were shining four years ago, but their light has only just reached the earth."
选项
A、You hear the gun before you see the smoke.
B、You see the smoke before you hear the gun.
C、The sound of the gun will reach you before the race starts.
D、Racers start to run before you see the smoke.
答案
B
解析
事实细节题 根据原文的举例可以得知会先看到枪管的烟,然后听到枪声。
转载请注明原文地址:https://tihaiku.com/zcyy/3624099.html
相关试题推荐
[originaltext]Pullingheavysuitcasesalldayinthesummerishardwork,es
[originaltext]Ifyou’reinchargeofaproject,thekeytosuccessisgettin
[originaltext]Ifyou’reinchargeofaproject,thekeytosuccessisgettin
[originaltext]W:Tony,Ijustmovedintomynewapartment,andIneedtohavet
[originaltext]W:Tony,Ijustmovedintomynewapartment,andIneedtohavet
[originaltext]W:Tony,Ijustmovedintomynewapartment,andIneedtohavet
Forhundredsofmillionsofyears,turtles(海龟)havestruggledoutofthese
[originaltext]ThisisRayMcCarthywiththenews.Reportsarecominginof
[originaltext]ThisisRayMcCarthywiththenews.Reportsarecominginof
[originaltext]Dr.AllenHershdesignssmellsforbusinesses.Hesaysthati
随机试题
A.forgeB.tracesC.privateD.fearE.puzzles
Peanutsareoneoftheworld’smostnutritiousfoods.Peanutscontainpound
Cigarettesmokingkills.Thatweknow.So,manufacturersmade【B1】______cigar
A.普通感冒 B.流行性感冒 C.社区获得性肺炎 D.医院获得性肺炎 E
读下图完成题。 下面关于①、②两地区域特征的描述正确的是( )
根据《建设项目工程总承包管理规范》(GB/T50358-2005),工程总承包项
由于你的表现很好。领导非常赏识你,并决定近期提升你,但有群众反映你为人缺乏热情,
投资型保险产品的功能主要包括()。A.基本保障功能 B.投机功能 C.
美国LEED评价体系中,申请项目在满足所有评估前提条件后,评估结果按照评估要点和
巷道光面爆破施工的正确做法有()。A.减小周边眼间距 B.选用高密度炸药
最新回复
(
0
)