首页
登录
职称英语
It turns out that measuring the distance to a star is an interesting problem
It turns out that measuring the distance to a star is an interesting problem
游客
2024-02-12
17
管理
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 [br] 【S9】
选项
答案
J
解析
从两方面判断,一是“have…done”结构,需用过去分词;二是文章在第1段和第3段的第1句均有“measure the distance”的提示。
转载请注明原文地址:https://tihaiku.com/zcyy/3443489.html
相关试题推荐
Doctorsshouldkeepquietandletpatientsexplaintheirproblems__________(而不是去
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
Mostpeoplewhotravellongdistancescomplainofjetlag(喷气飞行时差反应).Jetlag
随机试题
TheIntergovernmentalPanelonClimateChange(IPCC)wassetupin1988toa
ThomasDeQuincey’s______hasimpactedinfluenceonJamesJoyceandT.S.Eliot
[originaltext]W:Bob,willyoutellmesomethingaboutthenewintelligenthous
在AdobeIllustrator中,当使用其它放大镜工具时,若要临时切换为
在内部审计师对钢铁企业生产车间进行的效率审计中,下列哪项指标最合适?A.每小时生
早期妊娠时可见A.宫颈黏液干燥镜下见羊齿植物叶状结晶 B.阴道脱落细胞为底层细
某施工单位承接了两栋住宅楼,总建筑面积均为筏板基础(上反梁结构),地下2层,地上
各种运输方式内外部的各个方面的构成和联系,就是( )。 A.运输系统
可反映糖尿病患者近8~12周内血糖总水平的检查是 A.胰岛素释放试验B.
买入并有持有策略、恒定混合策略和投资组合保险策略有不同的特征,主要表现在()。
最新回复
(
0
)