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
7
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、Light speed is millions of times faster than sound speed.
B、Light speed is a million times slower than sound speed.
C、Light speed is about millions of times faster than sound speed.
D、Light speed is about a million times faster than sound speed.
答案
D
解析
细节辨析题 本题的四个选项表达很接近,要注意区别millions of times,about millions of times和a million times。原文中提到的光速比声速快约一百万倍。
转载请注明原文地址:https://tihaiku.com/zcyy/3599374.html
相关试题推荐
[originaltext]Americansaresufferingfromaserioussleepdeficitwhileal
[originaltext]Americansaresufferingfromaserioussleepdeficitwhileal
[originaltext]W:Icometoremindyouofameetingscheduledfor10o’clockthi
[originaltext]W:Icometoremindyouofameetingscheduledfor10o’clockthi
[originaltext]Theworld’ssmartestadolescentsinmathematicsandsciencea
[originaltext]Theworld’ssmartestadolescentsinmathematicsandsciencea
[originaltext]InBritainthereare11nationaldailynewspapersmidmostpe
[originaltext]M:Weseemtobehavingthisconversationoverandoveragain.W:
[originaltext]M:Weseemtobehavingthisconversationoverandoveragain.W:
[originaltext]M:Hey,Amy,whereareyouoffto?W:TotheRecreationCenter.I
随机试题
Shebustledaboutwithanassumptionofauthority.A、airB、suppositionC、appearan
Duringtheeighteenthcentury,LittleTurtlewasthechiefoftheMiamitribewh
Americaisacountrythatnowsitsatopthecherishedmyththatworkprovide
在装饰放线前,通常参与基准线(点)移交的单位有()。A.业主 B.总包 C
课外活动的组织者是学校、学校外教育机构和家长。()
急性白血病引起贫血的最主要原因是A.正常红细胞生成受到抑制 B.红细胞寿命缩短
根据工程项目计划管理的需要,工程项目进度计划应包括()。A.工程项目年度
中华腾飞,系于企业;企业腾飞,系于企业家。因此,中国经济的起飞迫切需要大批优秀的
员工培训管理制度一般来说包括( )。A.培训服务制度 B.入职培训制度 C
短路电流冲击值在什么情况下最大( )A.短路前负载,电压初相相位为0° B.
最新回复
(
0
)