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
A、1.3 seconds. B、Eight minutes. C、A life’s time. D、About four years. D事实细节题 原文中讲到距离地球最近的恒星离地球大约是四光年。
A、1.3 seconds. B、Eight minutes. C、A life’s time. D、About four years. D事实细节题 原文中讲到距离地球最近的恒星离地球大约是四光年。
admin
2010-05-09
57
问题
Light travels at a speed that is about a million times faster than the speed of sound. In one second, light travels about 300, 000 km, but sound travels only about 334 meters. You can get some idea of this difference by watching the start of a race. If you stand some distance away from the starter, you can see smoke come from his gun before the sound reaches your ears.
This great speed of light produces 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 rays left the moon 1.3 seconds before they reached you. The nearest star is so far away that the light that you can see from it tonight started to travel towards you about four years ago at a speed of nearly 20 million km per minute. In some cases, the light from one of tonight’s stars started on its journey to you before you were born. Thus, if we want to be honest, we cannot say, "the stars are shining tonight.” We have to say, "the tars look pretty. They were shining four years ago, but their light has only just reached the earth."
选项
A、1.3 seconds.
B、Eight minutes.
C、A life’s time.
D、About four years.
答案
D
解析
事实细节题 原文中讲到距离地球最近的恒星离地球大约是四光年。
转载请注明原文地址:https://kaotiyun.com/show/b9KK777K
0
大学英语六级
相关试题推荐
A、Fiftystudents.B、Fortystudents.C、Twenty-fivestudents.D、Fifteenstudents.BM:HowmanystudentstooktheexamlastSaturda
RiversByoriginalusage,ariverisflowingwaterinachannelwithdefinedbanks.Modernusageincludesriversthataremul
GriffithworkedforafirmthatspecializedineconomicdevelopmentinWashingtonD.C.becausesheneededmoneytopayforherd
A、Atschool.B、Athome.C、AtYouthClubs.D、AtYouthCenters.BWheredomostBritishyoungpeoplespendtheirsparetime?信息明示题。
A、45minutes.B、60minutes.C、90minutes.D、40minutes.BHowmuchtimewillthevisitorshavetotourNijojoCastle?信息明示题。文章最后提
A、Eliminatingtheoriginalvegetationfromthebuildingsite.B、Markingthehousesinanareasimilartooneanother.C、Deciding
Inthepast,theglobalaveragetemperaturemayhavebeen27℃.Itisdifficulttopredictthestrongregionalvariationsinthe
InanefforttomakeupforsomeoftheglaringlimitationsofIQtests,researchershavebeguntodevelopnewwaystomeasuret
GardeningThetechnologyofbeautyNow,gardeningwasdrivenbythreemaintrends:technologicalchange,plantprospecti
随机试题
临床常用的腧穴定位方法是
A.前屈B.后屈C.水平位D.前倾E.后倾
急性阑尾炎的体征中最有诊断意义的是
甲乙两人准备设立一个有限责任公司,在公司名称上咨询某律师,该律师的下列说法正确的是:
【2012年第3题】题1~5:某小型企业拟新建检修车间、办公房屋和10/0.4kV车间变电所各一处。变电所设变压器一台,车间用电负荷及有关参数见下表。假定5t吊车的设备功率为40kW,电焊机的等效三相负荷(设备功率)为30kW,变电所低压侧无功补偿容
水利工程保修期从工程()写明的工程完工日起一般不少于一年。
投资型保险产品的最大特点是()。
自2018年5月1日起,下列关于纳税人购进农产品,抵扣进项税额的描述正确的有()。
××市公安局与××市工商局联合行文禁止非法传销活动应使用公告。()
你对有的地方“有钱修庙。无钱修校"的现象怎么看?
最新回复
(
0
)