首页
登录
学历类
Light travels at a speed which is about
Light travels at a speed which is about
资格题库
2022-08-02
24
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 300,000 km. But sound travels only 344m. You can get some idea of his 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 born. Thus, if you want to be honest, you can 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. "If the information given in this passage is correct, when we look at a star at night ____.( )A. we will notice that it is not moving B. we cannot tell whether or not it still exists C. it is four years that the light we can see will reach us. D. it will be brighter than the moon.
选项
A. we will notice that it is not moving
B. we cannot tell whether or not it still exists
C. it is four years that the light we can see will reach us.
D. it will be brighter than the moon.
答案
B
解析
根据文章最后一段,我们现在看到的星星发出的光是四年前的。因此我们不知它是否仍然存在。
转载请注明原文地址:https://tihaiku.com/xueli/2664616.html
本试题收录于:
高起本和高起专英语题库高起本高起专成考分类
高起本和高起专英语
高起本高起专成考
相关试题推荐
Lighttravelsataspeedwhichisabout
Lighttravelsataspeedwhichisabout
Lighttravelsataspeedwhichisabout
Lighttravelsataspeedwhichisabout
随机试题
Forthispart,youareallowed30minutestowriteashortessayentitledThePo
[originaltext]M:Goodmorning.You’reMs.Clay,right?Dositdown,please.Now
Whatshetoldmeabouttheaffairsimplydoesn’tmakeany________.A、ideaB、meani
Wouldyouknowhowtohelp?Everyyear,thousandsofdriversandpasseng
如图,AB与半径为1的⊙O相切于A点,AB=23,AB与⊙O的弦AC的夹角为50
男性,30岁,有2年吸烟史。主诉:牙龈自动出血伴牙龈疼痛、口臭3天,无发热。检查
与结核分枝杆菌抗酸性有关的成分是A.索状因子 B.磷脂 C.分枝菌酸 D.
某旅行社今年第一季度利润表的部分数据如表5-1(单位:万元)所示,请据此资料回答
持仓限额制度是指交易所规定会员或客户可以持有的、按单边计算的某一合约投机头寸的最
下列哪项不是单纯性肥胖的病因A、营养过度 B、遗传因素 C、活动过少 D、
最新回复
(
0
)