首页
登录
职称英语
[originaltext] Not until somewhat recently (that is, in terms of human histo
[originaltext] Not until somewhat recently (that is, in terms of human histo
游客
2023-07-16
52
管理
问题
Not until somewhat recently (that is, in terms of human history) did people find a need for knowing the time of day. As best we know, 5000 to 6000 years ago great civilizations in the Middle East and North Africa initiated clock-making. With their bureaucracies and formal religions, these cultures found a need to organize their time more efficiently.
The Egyptians were the next to formally divide their day into parts something like our hours. Obelisks (slender, tapering, four-sided monuments) were built as early as 3500 B. C. Their moving shadows formed a kind of sundial, enabling citizens to partition the day into two parts by indicating noon. They also showed the year’s longest and shortest days when the shadow at noon was the shortest or longest of the year. Later, markers added around the base of the monument would indicate further time subdivisions.
Another Egyptian shadow clock or sundial, possibly the first portable timepiece, came into use around 1500 B.C. to measure the passage of "hours". This device divided a sunlit day into 10 parts plus two "twilight hours" in the morning and evening. When the long stem with 5 variably spaced marks was oriented east and west in the morning, an elevated crossbar on the east end cast a moving shadow over the marks. At noon, the device was turned in the opposite direction to measure the afternoon "hours".
In the quest for more year-round accuracy, sundials evolved from flat horizontal or vertical plates to more elaborate forms. One version was the hemispherical dial, a bowl shaped depression cut into a block of stone, carrying a central vertical gnomon (pointer) and scribed with sets of hour lines for different seasons. The hemicycle, said to have been invented about 300 B. C. , removed the useless half of the hemisphere to give an appearance of a half bowl cut into the edge of a squared block.
选项
A、4000 - 5000.
B、50 - 60,000.
C、500 - 600.
D、5000 - 6000.
答案
D
解析
此题考查听细节的能力。只要抓住关键词“5000 to 6000 years ago”。
转载请注明原文地址:https://tihaiku.com/zcyy/2840902.html
相关试题推荐
[originaltext]MoreAmericansareGooglingthemselves—andmanyarechecking
[originaltext]Extremelyhotweatheriscommoninmanypartsoftheworld.A
[originaltext]Extremelyhotweatheriscommoninmanypartsoftheworld.A
[originaltext]M:Ireallycan’tstandthemanymore!W:Who?Whathappened?M:(
[originaltext]M:Ireallycan’tstandthemanymore!W:Who?Whathappened?M:(
[originaltext]W:Iamabitfedupwithcatchingthesametraineverymorning,
[originaltext]W:Iamabitfedupwithcatchingthesametraineverymorning,
[originaltext]W:Iamabitfedupwithcatchingthesametraineverymorning,
[originaltext]W:Iamabitfedupwithcatchingthesametraineverymorning,
[originaltext]W:Iamabitfedupwithcatchingthesametraineverymorning,
随机试题
TheCapitalofNorthernIslandis______.A、BelfastB、GlasgowC、DublinD、HullA
【B1】[br]【B3】[audioFiles]audio_eufm_j04_007(20082)[/audioFiles]lower
已知2015年10月30日美元兑人民币汇率为6.3495,当日欧元兑人民币汇率为
常用的需求分析方法有:面向数据流的结构化分析方法(SA)、面向对象的分析方法(O
A.因果分析图 B.控制图 C.调查表法 D.分层法 E.排列图法用来检
右边四个图形中,只有一个是由左边的四个图形拼合(只能通过上、下、左、右平移)而成
2019年末,我国80后、90后、00后人数分别为2.21亿人,2.08亿人,1
下列选项中,哪些是按行政关系排列的()。A.县、中心镇、一般镇、行政村 B
如果父亲和孩子都是A型血,那么孩子的母亲的血型有几种可能?() A.四种B
表象在心理发展的过程中,是从感知向思维过渡的( )。A.初岁环节 B.中
最新回复
(
0
)