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 made this eclipse so unique?
What made this eclipse so unique?
admin
2012-04-23
67
问题
What made this eclipse so unique?
On December 25, 2000, many people across North America received a rare Christmas treat when the moon passed in front of the sun resulting in a partial solar eclipse.
Solar eclipses occur when the moon passes between the earth and the sun, and the moon’s shadow covers part of the earth, and a total solar eclipse takes place when the moon’s shadow blocks out the sun entirely. What made this particular solar eclipse unique was that such an event has occured on December twenty - fifth only 30 times during the past 5000 years, the last time in 1954. But people must be exceptionally careful when attempting to view a solar eclipse. Without taking precautionary measures, one can permanently damage the retina of the eyes; however, there are several safe methods of witnessing this heavenly marvel.
First, you can view a solar eclipse by using eclipse safety glasses for filtering out the sun’s harmful rays. They should be used when any part of the sun is visible. Sunglasses can block out some of the sun’s ultraviolet rays, but the results can be very deceptive. The eye’s natural reaction to this darken state when wearing sunglasses is to make the pupil larger, which allows in more light and can intensify the damage to your eyes. You can also watch an eclipse by projecting the sun’s image on a piece of paper either by using a telescope, or easier yet, by creating a pinhole in a piece of paper and viewing the result on another piece of paper, thus called a pinhole projector.
Only during a total eclipse when the sun is completely and briefly covered can you watch the eclipse without eye protection. Even then, extreme caution should be taken. In case you didn’t catch this last spectacular eclipse on December twenty - fifth, 2000, there’s no need to fret. Your posterity can record the next eclipse on Christmas in the year 2307, but only if their visiting the west coast of Africa for the holidays.
选项
A、Its location for viewing in the world.
B、Its timing on the calendar.
C、Its movement across the sky.
D、Its beautiful scen
答案
B
解析
对于这次日偏食之所以独特的原因,报道中说得很清楚:What made this particular solar eclipse unique was that such an event has occured on December twenty-fifth only 30 times during the past 5000 years, the last time in 1954。即这种发生在圣诞节的日食在过去的5000年中只有30次,可见它这种日期是非常稀罕的,故正确答案应为B。
转载请注明原文地址:https://kaotiyun.com/show/2UiO777K
0
专业英语八级
相关试题推荐
Canada’sEducationSystemTheCanadiangovernmentprovides【1】publiceducationforallstudentsfromKindergartentoGrade12.
Canada’sEducationSystemTheCanadiangovernmentprovides【1】publiceducationforallstudentsfromKindergartentoGrade12.
Wesometimesthinkhumansareuniquelyvulnerabletoanxiety,butstressseemstoaffecttheimmunedefensesofloweranimalsto
Computers,andespeciallyconnectingtotheInternet,provideuniqueopportunitiestoenhancescienceandmatheducation.Tak
Computers,andespeciallyconnectingtotheInternet,provideuniqueopportunitiestoenhancescienceandmatheducation.Tak
Itwasreportedinthepresssometimeagothatafewsecond-andthird-yearstudentsinaprovincialuniversitydecidedtotry
Theworld’slastknowncaseofsmallpoxwasreportedinSomalia,theHornofAfrica,inOctober1977.Thevictimwasayoungcoo
ThedayofprotestingatEnglishWikipediabroughtmeasurableresults,1.______thesite’sadministratorsreported:fourmillion
WhichofthefollowinganimalsisNOTuniquetoAustralia?
IrelandisuniqueamongEuropeancountriesfor______.
随机试题
奥伦护理系统结构示意图确定的在支持教育系统中护士主要的活动是
某消防技术服务机构在一级注册消防工程师张某主持下,在对一新建商店建筑进行了消防设施检测,未严格按照相关规程操作,并出具严重不符实的检测报告。消防技术服务机构收取检测费6万元,好处费5万元;张某个人收取好处费3万元。以下处罚和处理符合规定的是()。
当GDP>1+C+(X-M)时,物价变动趋势是()。
个案社会工作是社会工作中的一种基本方法,其以个别方式,对感受困难、生活失调的()提供物质帮助、精神支持等方面的服务,以解决他们的问题,增强其社会适应能力。
行政领导者的外在技能主要包括:知识水平、智能水平、决策能力、组织控制能力、用人能力和()等。
心理旋转实验使用的因变量指标是
国家公务员
[2004年]设随机变量X的分布函数为其中参数α>0,β>1.设X1,X2,…,Xn为来自总体X的简单随机样本.当α=1时,求未知参数β的最大似然估计量;
一个栈的初始状态为空。现将元素1、2、3、4、5、A、B、C、D、E依次入栈,然后再依次出栈,则元素出栈的顺序是
Whatisthesignificanceofthenewtechnology?Howmanynanosecondsequalonesecond?
最新回复
(
0
)