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
It turns out that measuring the distance to a star is an interesting problem! Astronomers have【S1】______up with two different te
It turns out that measuring the distance to a star is an interesting problem! Astronomers have【S1】______up with two different te
admin
2013-06-17
101
问题
It turns out that measuring the distance to a star is an interesting problem! Astronomers have【S1】______up with two different techniques to estimate how far away any given star is.
The first【S2】______uses triangulation(三角测量). The Earth’s【S3】______around the sun has a diameter of about 186 million miles(300 million kilometers ). By looking at a star one day and then looking at it again 6 months later, an astronomer can see a【S4】______in the viewing angle for the star. With a little trigonometry(三角学), the different angles yield a distance. This technique【S5】______for stars within about 400 light years of earth.
There is no direct method currently【S6】______to measure the distance to stars【S7】______than 400 light years from Earth, so astronomers instead use brightness measurements. It turns out that a star’s color spectrum is a good indication of its actual brightness. The【S8】______between color and brightness was proven using the several thousand stars close enough to earth to have their distances【S9】______directly. Astronomers can therefore look at a distant star and determine its color spectrum. From the color, they can determine the star’s actual brightness. By knowing the actual brightness and comparing it to the【S10】______brightness seen from Earth(that is, by looking at how dim the star has become once its light reaches Earth), they can determine the distance to the star.
A)capable B)works
C)put D)difference
E)track F)come
G)relationship H)available
I)technique J)measured
K)nearer L)apparent
M)orbit N)applies
O)farther
【S4】
选项
答案
D
解析
根据语境判断。前半句指在两个不同时间观看,推断有差异;下一句有明确的提示“different angles”。
转载请注明原文地址:https://kaotiyun.com/show/Hn07777K
0
大学英语四级
相关试题推荐
Manyteachersbelievethattheresponsibilitiesforlearningliewiththestudents.【C1】______alongreadingassignmentisgiven,
Theprincipaltechniqueincurrentuseforteachingreadingattheintermediatestageisthatofsupplementary,gradedreaders.
Adeviceto"sleeponit"couldbewellfounded,scientistssay.Afteragoodnight’ssleep,aproblemthatseemedinsurmountabl
Ourbrainshavebeenprocessingsophisticatedinformationviaoursensesformillionsofyears.Sowhyisitwearestill【B1】___
A、eatingallofthefood.B、usingtherightknives,forksandglasses.C、goingtothetoilet.D、drinkingtoomuchwine.B此题考查听细
Theycallthemthenewbreadearners.Theyarewomen,andtheyaresettotakeover.Womenarebeginningtorise【S1】______to
Beforethe1850’s,theUnitedStateshadanumberofsmallcolleges,mostofthemdatingfromcolonialdays.Theyweresmall,ch
A、Theweight.B、Thechemicalcomposition.C、Thecolor.D、Theshape.D
A、BuyingapairofAdidastennisshoes.B、AskingherfatheraboutAdidasshoes.C、DiscussingwithherfatheraboutAdidasshoes.
Throughouthistorythebasicunitofalmosteveryhumansocietyhasbeenthefamily.Membersofafamilylivetogetherunderthe
随机试题
实行竣工验收备案制度的工程有( )。
经采购人同意,中标、成交供应商可以依法采取分包方式履行合同。供应商就采购项目和分包项目向采购人负责,分包供应商就分包项目承担责任。()
H股的发行与上市的条件可以是,公司于上市时市值不低于()亿港元,且最近1个经审计财政年度收入至少()亿港元,满足香港联交所最新修订的《上市规则》对盈利和市值的要求。
(2015)资料一思达公司前身是C国J省一家冷气设备生产企业。1985年开始,公司集中资源研发、生产当时国内市场处于一片空白的家用空调和大型柜式空调,企业获得了迅猛发展。到1994年,思达公司已成为C国最大空调生产基地。1994年,思达公司积累了大量的资
一般纳税人委托其他单位加工材料收回后直接对外销售的,其发生的下列支出中,不应计入委托加工材料成本的是()。
AnExpensiveMistakeIstherewaterontheplanetMars?IstherelifeonMars?WasthereeverlifeonMars?ScientistsfromN
下列不属于中国人民银行具体职责的是()。
(Ⅰ)证明拉格朗日中值定理:若函数f(x)在[a,b]上连续,在(a,b)内可导,则存在ξ∈(a,b),使得f(b)—f(a)=f′(ξ)(b—a);(Ⅱ)证明:若函数f(x)在x=0处连续,在(0,δ)(δ>0)内可导,且=A,则f′+(0)存在,且f
微分方程xy’=+y的通解为_________.
______sheepwasgrazingonthehillandaneyedogwaswatchingthemfromafar.
最新回复
(
0
)