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
40
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/3624098.html
相关试题推荐
[originaltext]On15th,Feb1989aninstantsurveywascardedoutamong18o
[originaltext]On15th,Feb1989aninstantsurveywascardedoutamong18o
[originaltext]On15th,Feb1989aninstantsurveywascardedoutamong18o
[originaltext]JaneAddamscamefromawell-to-doandculturedfamily.Shew
[originaltext]JaneAddamscamefromawell-to-doandculturedfamily.Shew
[originaltext]W:David!CanIgiveyouahandwithoneofthosegrocerybags?M
[originaltext]M:Friday’sspeakerissupposedtobewonderful.Areyougoingt
[originaltext]M:Friday’sspeakerissupposedtobewonderful.Areyougoingt
[originaltext]M:Friday’sspeakerissupposedtobewonderful.Areyougoingt
[originaltext]M:Friday’sspeakerissupposedtobewonderful.Areyougoingt
随机试题
Alotofpeoplewanttheirlivestochangeforthebetterbutnoteveryonep
—Whatdoyouthinkofthefivedollmascotsforthe2008OlympicGames?—______
Whenitcomestogettingahead,expertssay,theABCsofbusinessshouldinclu
[originaltext]Weknowwehavetopayforwhatweget.Ifwebuyfood,weha
患者男,30岁。夜间发作性腹部烧灼样痛2月余,进食后能迅速缓解,昨起排柏油样便3
某工程控制网点的误差椭圆长半轴,短半轴长度分别为8mm和6mm,则该点的平面点位
阿托品不具有的作用是A.松弛睫状肌 B.松弛瞳孔括约肌 C.调节麻痹、视近物
下列对体位的描述,错误的是A.仰卧位时,踝背屈90°可防止足下垂 B.仰卧位主
普遍津贴型社会保障的资金来源是()。A.政府预算拨款 B.个人缴费为主 C
(2019年真题)某企业为增值税一般纳税人,确认商品销售收入同时结转成本。201
最新回复
(
0
)