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
外语
What does February 29th mean to you? For most people it means an extra day at work, which might explain why a leap year is gener
What does February 29th mean to you? For most people it means an extra day at work, which might explain why a leap year is gener
admin
2019-02-25
50
问题
What does February 29th mean to you? For most people it means an extra day at work, which might explain why a leap year is generally considered to be unlucky. This is particularly so for those who only have the chance to celebrate their real birthday once every four years.
【B1】______The first attempt at rationalizing the calendar was made by the ancient Egyptians over two thousand years ago. Having worked out that there were 365 days in a year they realized that every fourth year would need 366 days and set up their calendars accordingly. It was another two hundred years or more before the Romans, under Julius Caesar, settled upon February as the month to which the extra day should be added.
【B2】______This is due to the fact that there are six hours left over from a strictly 365-day year. The rotation of the Earth around the sun, though predictable as far as orbit and gravity are concerned, is not as fixed as might be assumed as other factors, such as the effect of massive earthquakes, must be taken into account.
【B3】______The ancient Egyptians set the ball rolling by developing early versions of the sundial. Later timekeepers included burning candles and water flowing through measurable holes. Perhaps surprisingly, the first hourglass to use the flow of sand did not appear until medieval times. Nevertheless, measuring time remained a relatively inexact science and it was not until the invention of the pendulum clock in the seventeenth century that it became more accurate.
【B4】______the lack of precision in measuring hours and minutes created problems in the maritime sector. Sailors the world over had difficulty establishing exactly where they were at sea e-ven though they were able to use the sun and stars to guide them. The invention of reliable, sea-going clocks in the eighteenth century enabled sea-farers to calculate their longitude. This, coupled with knowledge of their latitude, took the guesswork out of pinpointing their position. Such advances meant that exploration of the oceans and trade by sea could flourish.
【B5】______The fact that these two clocks used different measuring systems meant that eventually they showed different times. As a result of this, in the 1970s scientists corrected the discrepancy by introducing the leap second. However, it is not needed every year—the last leap second was on 1st January 2006. Nevertheless, in spite of the advances in timekeeping the difficulty of measuring time with faultless precision has not been completely resolved.
The US has proposed using the atomic clock exclusively to measure world time thereby making the older timekeeping systems and leap seconds themselves redundant. If this method was adopted it would mean that time would no longer be measured by the rising and setting of the sun. However, there is some resistance to the idea as it is claimed that we would run the risk of being out of step with the rhythms of the planet’s natural cycle.
Questions 61 -65: Choose from the sentences A - G the one which best fits each gap of 61 - 65. There are two extra sentences which you do not need to use.
A. Apart from difficulties in measuring years and months with accuracy, which had an effect on the development of agriculture.
B. When early man began to farm the land, an understanding of how to measure time rapidly became a priority.
C. The earthquakes sometimes affect the relevant calculations of calendar.
D. Leap years are no new phenomenon.
E. In the 1950s the invention of the atomic clock revealed that timekeeping based on the movements of the Earth was less accurate than that based on vibrating atoms.
F. For us a leap year simply means that we have to work an extra day in February.
G. A calendar which, relies on the cycles of the sun is bound to run into trouble sooner or later, experts agree.
【B4】
选项
答案
A
解析
上文提到农业发展的需要使得古人采用多种方法来测量时间,而下文讲述了无法准确测量小时和分钟对航海方面所产生的影响。A项“除了准确测量年份和月份存在困难,而对农业的发展造成影响外”起到承上启下的作用。
转载请注明原文地址:https://kaotiyun.com/show/uD8K777K
本试题收录于:
B类竞赛(英语专业本科专科)题库大学生英语竞赛(NECCS)分类
0
B类竞赛(英语专业本科专科)
大学生英语竞赛(NECCS)
相关试题推荐
Henryisabeggar.Hehasthehabitofpickingupcigaretteendsleftbyotherpeople.Hecanalwaysmakeonenewcigaretteout
Oldpeoplearealwayssayingthattheyoungarenotwhattheywere.Thesamecommentismadefromgenerationto【C1】______andit
Chinesestudentsare【D1】______willingtostudyveryhardforlonghours.Thisisan【D2】______,butitisoftenan【D3】______ofs
Therearealwayspeoplewhocanfindareasontocriticizestronglyanynewtechnologyastoopersonallyinvasive,butI’mallf
Ofalltheareasoflearningthemostimportantisthedevelopmentofattitudes.Emotionalreactionsaswellaslogicalthought
Aswehaveseen,thefocusofmedicalcareinoursocietyhasbeenshiftingfromcuringdiseasetopreventingdisease—especially
Aswehaveseen,thefocusofmedicalcareinoursocietyhasbeenshiftingfromcuringdiseasetopreventingdisease—especially
Verysoon,unimaginablypowerfultechnologieswillremakeourlives.Thiscouldhavedangerousconsequences,【C1】______(especial)
Doyoufindgettingupinthemorningsodifficultthatit’spainful?Thismightbecalledlaziness,butDr.Kleitmanhasanew
Generallyspeaking,Collegegraduationbringsboththesatisfactionofacademicachievementandtheexpectationofawell-paying
随机试题
商业银行参与货币市场的目的是()
肺炎患儿如果并发严重腹胀及肠鸣音消失,最可能的原因是
上海现代中医药股份公司、国内外专家与美国FDA官员围绕扶正化淤片美国Ⅱ期临床试验进行了长时间的合作攻关,扶正化淤片成功完成美国Ⅱ期临床试验是世界肝纤维化治疗领域的重大突破,不仅填补了西方医学界的空白,也使其有望成为首个获准进入美国主流医药市场的复方中药,是
心理健康的规定不是一成不变的,它可以随着社会及个体的变化不断调整。心理平衡表现为没有欲望和观念的冲突,没有紧张、焦虑、畏缩等不良情绪反应。心理健康就是人通过不断的心理活动,把由于种种原因造成的心理失衡调适为心理平衡的状态。这段文字意在表明()。
在地籍管理工作中,土地条件调查包括()。
关于同一控制下企业合并,下列会计处理中正确的有()。
某城市小区的居民被附近一个建筑工地项目严重干扰。噪音下许多居民无法集中精力,工地的长明灯使许多人无法入睡。还有的人甚至产生轻微的病症,如头痛和眩晕。社区工作机构的工作者依据居民的意见将社区居民组织起来,搜集了噪音的具体数据资料,与居民一起到建筑公司解决这一
某篮球比赛14.00开始,13:30允许观众入场,但早有人来排队等候入场。假设从第一个观众来到时起,每分钟来的观众人数一样多,如果开3个入场口,13:45时就不再有人排队;如果开4个入场口,13:40就没有人排队,那么第一个观众到达的时间是()。
把下面的六个图形分为两类,使每一类图形都有各自的共同特征或规律,分类正确的一项是:
宋朝最重要的立法活动形式是()。
最新回复
(
0
)