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
57
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.
"Are there living things in space?" " ______."
选项
A、We have already got an answer to this question
B、We will never get an answer to this question
C、We got an answer to this question long ago
D、We may get an answer to this question in the next few years
答案
D
解析
文章最后一句告诉我们,在未来的几年里,我们也许就得出这个问题的答案了。
转载请注明原文地址:https://kaotiyun.com/show/K5qC777K
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
Ifyouareinneedofhelp,you’dbetternot______(hesitation)totellme.
You’dbetterhurry,______youmightbelateforclass.
WhendidFather’sDayofficiallybegintohavenationalpopularity?WhatflowerwillbepopularonFather’sDay?
NotuntilMr.SmithcametoChina______whatkindofcountrysheis.
Isit______youwerebornthatdecidesyournationality?
Thefindingsshowingeneraltermsthatcontractionofthebrainbegins______inpeopleinthecountrythaninthetowns.
HolidaycelebrationsintheUnitedStatesoften______.Thejudge______.
IntheUnitedStates,teachingisveryimportant.Ifteachersdonotteachwell,studentscomplain.Ifmanystudentsdonotunde
ButthoseoceansremainlifelessuntilsometimeinMarchorearlyApril,whenthefirstlivingthingsdevelop.
随机试题
在XCZ-102型动圈式显示仪表安装位置不变的情况下,每安装一次测温元件时,都要重新调整一次外接电阻的数值。当配用热电偶时,使R外为();当配用热点阻时,使R外为()。
男性患者,10岁,3周前受凉后出现“感冒”样症状,近日突发皮肤及牙龈出血。查:体温37℃,肝、脾不大;Hb125g/L,WBC正常,PLT20×109/L。骨髓:增生活跃,巨核细胞增多,幼稚型占30%,本病治疗应首先采用
静脉注射丙种球蛋白的禁忌证是
甲到本村乙家买柴油时,因屋内光线昏暗,甲欲点燃打火机看油量。乙担心引起火灾,上前阻止。但甲坚持说柴油见火不会燃烧,仍然点燃了打火机,结果引起油桶燃烧,造成火灾,导致甲、乙及一旁观看的丙被火烧伤,乙、丙经抢救无效死亡。后经检测,乙储存的柴油闪点不符合标准。甲
[2012年第031题]我国塔式高层住宅的平面形式中,T形、Y形、.蝶形多用于北方地区,正十字形、井字形、风车形多用于南方地区,其最主要的制约因素是:
常用的风险识别方法有哪些?
()是指由收购人与上市公司特定的股票持有人就收购该公司股票的条件、价格、期限等有关事项达成协议,由公司股票的持有人向收购者转让股票,收购人支付资金,达到收购的目的。
2014年6月,某化妆品生产企业(增值税一般纳税人)销售化妆品,开具的增值税专用发票上注明的价款为40000元,另外收取包装物押金3627元,该化妆品生产企业与购买方签订合同,要求3个月内返还包装物;从小规模纳税人处购进生产用原材料,取得税务机关代开的增值
在一段时间内有10架飞机飞过,其中6架为敌机,雷达报告到其中的5架,并把2架民用机误报为敌机。增加信号的先验概率会使()
Stressiswithusallthetime.Itcomesfrommentaloremotionalactivityaswellasphysicalactivity.Itisuniqueandperson
最新回复
(
0
)