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
专升本
On a clear night you can see many stars in the sky. These stars are millions of miles away. Are there living things on any of th
On a clear night you can see many stars in the sky. These stars are millions of miles away. Are there living things on any of th
admin
2011-04-26
22
问题
On a clear night you can see many stars in the sky. These stars are millions of miles away. Are there living things on any of the stars? People have always thought about this question. They could not find the answer before now. Today scientists know more about space than ever before. Some machines can help them look for the answer.
How will scientists do this? People can’ t go to the stars. The stars are far away. A person would take hundreds of years to the next star in a spaceship. So scientists are sending out radio signals. These signals travel in space at the speed of light. At that speed, radio signals will take 25 years to reach the next star. The signals ask "Is there anyone out here?". Living things in space must have machines to hear the signals. We will not get an answer to our signals for more than 50 years. However, scientists are already listening. Someone from space may be trying to send signals to us, too.
Scientists also have sent large telescopes into space. A telescope can make things look larger. The telescopes are going around the earth. They are looking for life on other worlds. In the next few years we may get an answer to the question, "Is there life in space.
The speed of radio signals is ______ a spaceship.
选项
A、a little greater than
B、as great as
C、much greater than
D、less than
答案
C
解析
文章第二段指出,人们乘坐的宇宙飞船到达另一个星球要用几百年,而无线电信号到达另一个星球则需用25年。因此,无线电信号比宇宙飞船的速度快得多。
转载请注明原文地址:https://kaotiyun.com/show/zwqC777K
本试题收录于:
英语题库成考专升本分类
0
英语
成考专升本
相关试题推荐
Youhadbetternot______therealone.
Therestofhislifeis______tothecauseofinternationalexchangeofvisitingscholars.
Ihopethingswouldgetbetter,(butasitistheyaregettingworse).
Thisstorymentionscollegegraduatesat_______.Whichofthefollowingthingsdidnothappeninthefouryearsthattheclass
Somecountriesstillhavedeathpenalty(死刑),butitnolonger【B1】inBritain.Afteraparticularly【B2】murder,Britishpeople
Choosethecorrectstatement.Whichhappenedlast?
I______thepaperafterlunch:That’soneofthethingsIreallyenjoy.
(Citybornandcitybred),Ihavealwaysregardedthecountryassomethingyoulookatthroughatrainwindow,orsomethingyou
Whatkindsofthingshaveactivistsdonetoprotectresearchanimals?Wherewasthelistofpeopletargetedbytheactivistspo
随机试题
大剂量长期使用异烟肼可能产生哪些不良反应?如何防治?
下面句子中的“众”意义与其它三项不同的一项是()。
系统性红斑狼疮合并妊娠时的注意事项。
A、出生后4周内B、出生4周到12岁左右C、出生2周岁到12岁D、自乳房发育等第二性征出现至生殖器官发育成熟、获得性生殖能力E、月经初潮至生殖器官发育成熟女性一生各生理阶段分期中,青春期是指
人体含量最高的微量元素是
患者女,42岁。月经量增多,经期延长,前来就诊。妇科检查:子宫增大如孕12周大小,质硬,表现不规则、结节状,双附件无异常。该患者可能是
法医刘某是某公安机关的工作人员,他对一起伤害案件的伤情作了鉴定,鉴定意见为轻伤,那么他处于何种诉讼地位?()
下列关于成本动因(又称成本驱动因素)的表述中,不正确的是()。
指导儿童欣赏美术作品,主要是帮助儿童分清哪些画是好的,哪些画不好。()
有编号为1、2、3、4四把椅子,四位同学随机坐到椅子上,坐好后再站起,用编号为5的椅子替换4号椅子,这四位同学再次坐到椅子上,规定每位同学不能坐到原来的椅子上,共有多少种方法?
最新回复
(
0
)