首页
登录
学历类
Light travels at a speed which is about
Light travels at a speed which is about
练习题库
2022-08-02
23
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. "What is the meaning of the word "about" similar to?( )A. At most. B. At least. C. Only. D. Around.
选项
A. At most.
B. At least.
C. Only.
D. Around.
答案
D
解析
根据文章第一句话,光速大概是声速的1百万倍。故表示不确定的“大概,左右”,故选D。
转载请注明原文地址:https://tihaiku.com/xueli/2664614.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
Itiscommonlyheldthatdrinkingmoderateamountsofalcoholcanreducethe
对于35KV的线路感应过电压,描述正确的是()。A.会使线路产生闪络 B.对线
已知一正方体,各边长为a,沿对角线BH作用一个力F,则该力在x1轴上投影的大小是
目前,我国商业银行资产支持证券的发行和交易场所是()。A.全国银行间债券市场
患者,男,32岁,低热、乏力、消瘦半月余。查体:心脏(-),右下侧胸部饱满,呼吸
具有逐瘀泻热功用的方剂是B.桃核承气汤 C.生化汤 D.复元活血汤 E.血
对某一类标准化对象制定的覆盖面较大的共性标准,可作为制定专用标准依据的是城乡规划
男性45岁,综合征患者,实验室检查如下:基础水平尿17-羟、17-酮水平均明显升
根据《建设工程监理规范》,项目监理机构处理施工合同争议时应进行的工作有( )。A
卫生陶瓷分为瓷质卫生陶瓷和炻陶质卫生陶瓷,其中瓷质卫生陶瓷的吸水率()。A.E
最新回复
(
0
)