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
2023-07-11
20
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/2827223.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
生产经营单位的特种作业人员必须按照国家有关规定经生产经营单位组织的安全作业培训,
土颗粒级配曲线越陡,说明级配越良。
6岁小孩,近10d来极度烦躁,神情淡漠,午后体温37~38℃。现在又突然意识丧失
(2016年真题)基金登记过程实际上是()。A.基金托管人对账户管理的过程
某植物提取物遇皮肤呈蓝色,可能含有A.环烯醚萜 B.鞣质 C.皂苷
下列各项中,属于计算机审计实施阶段的工作的是()。A.了解计算机系统在组织机构内
评价装饰效果主要考虑( )。A.质感 B.耐久性 C.经济性 D.环保性
谣言传播指不正确事实的非正式渠道传播,它是对事实的蓄意渲染、夸大、歪曲,或根本是
有的心理学家把问题行为分成()问题行为、()问题行为和社会
A.凉血消肿 B.消肿止痛 C.养血舒肝 D.补气养阴 E.健脾补肾千金
最新回复
(
0
)