首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
专升本
Everyone uses the expressions AM and PM. But do you exactly know what they mean and how they came into being? As you know, t
Everyone uses the expressions AM and PM. But do you exactly know what they mean and how they came into being? As you know, t
admin
2011-03-26
50
问题
Everyone uses the expressions AM and PM. But do you exactly know what they mean and how they came into being?
As you know, the turning of the earth makes the sun and the stars seem to move across the sky. Daylight,of course,【21】. when the sun rises in the east and ends in the west,when the sun is high【22】the sky, between these two positions, half of the daylight hours have been spent.
Therefore, by noticing【23】the sun stood in the sky, early man know they could tell the time of the day. At night the motion of the stars【24】the same purpose. The important thing in keeping time is to know the exact moment of【25】. For each of us,wherever we are, noon is when the sun is directly over head. Think of an imaginary line【26】the sky, stretching from the north point of your horizon just to the south point.
When the sun cross your meridian (子午线), it is noon for you. When the sun still【27】of this line, or the meridian, it is morning. After the sun has crossed this line, it is【28】.
The Latin word for" midday" is" deridian" ,【29】which comes our word meridian. So AM is an abbreviation(缩写词) for "ante meridian " ,of before midday, and PM for after midday. Each of the world’s time zones(时区)is about fifteer degrees wide in longitude(经度) ,which is about the distance the sun moves through the sky in an hour.【30】lives in the same zone observes noon at the same moment. In this way, the time is different by one hour. as you move through each time zone.
选项
A、afternoon
B、about a day
C、for an hour
D、years
答案
A
解析
转载请注明原文地址:https://kaotiyun.com/show/DdvC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Wehaveworkedthewholeday.(EveryoneistiredwiththeexceptionofJohn).
(他别无选择)buttolayfactsbeforethepublicexactlyastheyoccurred.
Theyalwaysgivethevacantseatsto______comesfirst.
Ifwewereaskedexactlywhatweweredoingayearago,weshouldprobablyhavetosaythatwecouldnotremember.Butifwehad
Theleaderoftheexpedition______everyonetofollowhisexample.
SeveralsmallearthquakeswerepredictedinNewYorkState,inthe______(east)partoftheU.S.A.
Wecouldn’treadthenoticeontheboardbecauseseveralpeoplewerestanding______it.
Recently,severalthousandcomputersintheUnitedStateswereattackedbyavirus.Thecomputerswereslowedorshutdown.But
随机试题
《企业会计准则——基本准则》规定,我国所有的企业都必须采用()
石崇和王恺争豪,并穷绮丽,以饰舆服。武帝,恺之甥也,每助恺。尝以一珊瑚树高二尺许赐恺。枝柯扶疏,世罕其比。恺以示崇;崇视讫,以铁如意击之,应手而碎。恺既惋惜,又以为疾己之宝,声色甚厉。崇日:“不足恨,今还卿。”乃命左右悉取珊瑚树,有三尺、四尺,条千绝世,光
乳痈初起的临床症状不包括
促销的主要任务是使客户在需要的时间和地点获得产品。()
试论述职业权利和职业责任的关系?
从甲地(60°E,50°N),8小时后到达乙地(120°W,60°N)。那么飞机出发时航向()。
“拔苗助长"与“庖丁解牛"这两个成语共同说明的道理是()。
【F1】Despitethegeneralnegativefindings,itisimportanttorememberthatallchildrenwholivethroughadivorcedonotbehav
请设置隐藏指定行。
KillingMeMicrosoftlywithPowerpointPowerpoint,thepublic-speakingapplicationincludedintheMicrosoftOfficesoftware
最新回复
(
0
)