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
2024-05-15
19
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/3599375.html
相关试题推荐
[originaltext]Itisoftenclaimedthatnuclearenergyissomethingwecanno
[originaltext]Itisoftenclaimedthatnuclearenergyissomethingwecanno
[originaltext]Itisoftenclaimedthatnuclearenergyissomethingwecanno
[originaltext]EmilyDickinsonisoneofthegreatestAmericanpoets.Shewa
[originaltext]EmilyDickinsonisoneofthegreatestAmericanpoets.Shewa
[originaltext]InBritain,(26)arrangementsforinvitingandentertainingg
[originaltext]TheUnitedStateshadwonitsindependencefromBritainjust
[originaltext]TheUnitedStateshadwonitsindependencefromBritainjust
[originaltext]M:Excuseme.Whoisinchargeofchanginghousingarrangementon
[originaltext]M:Excuseme.Whoisinchargeofchanginghousingarrangementon
随机试题
AmericanMoviesAmericanMovies【T1】______oftheUnitedStates.Manymovi
A.吮咬唇 B.咬物 C.吮咬颊 D.吮其他指 E.吮拇指牙弓缩窄、腭穹
下列易患异嗜癖的为( )。A.缺钙儿童 B.缺锌儿童 C.缺铁儿童 D.
关于沪深300股指期货合约,下列叙述有误的是( )。A.最小变动价位是0.2指
男性,50岁。反复发生夜间呼吸困难1个月,加重1天就诊,体格检查:血压180/1
下述保险与赌博异同点的说法,正确的是( )。 A.保险和赌博都是分散已有风
人们的实践活动从来都不是随心所欲的,任何人都只能在一定的条件下,运用恰当的方法去
药师对药品不良事件、新药上市后被召回或撤市的案例应及时掌握,不能松懈 因导
流行性出血热多尿移行期的临床特点是A.尿量开始增加,临床症状好转 B.尿量开始
“借款单”属于()。A:外来原始凭证B:自制原始凭证C:一次凭证D:累计凭
最新回复
(
0
)