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
A、A person who is awake early. B、A bird that catches the worm early in the morning. C、A plane which flies in the morning. D、A co
A、A person who is awake early. B、A bird that catches the worm early in the morning. C、A plane which flies in the morning. D、A co
admin
2010-04-12
22
问题
An "early bird" used to be a person who was awake early and began his(or her) day’s work before other people. The people, who said it, were thinking of an old saying: It is the early bird that catches the worm. But since 1965 the Early Bird has had a different meaning. The modem Early Bird is a communications satellite in orbit round the earth.
The use of wires to carry telephone communications and for other purposes of the same kind does not satisfy modem needs. We had to use radio. But the radio waves that we use for these purposes--microwaves--travel in straight lines. They do not follow the curve of the earth’s surface. We can send them from one radio station to another—a relay station--where we amplify them and send them do a third station. If there is no relay station within about 50 kilometers to receive the microwaves, they will continue into space. At a certain height, some of them are sent back to earth. A powerful station several hundred kilometers from their starting point can receive them. But these are not good ways of sending the thousands of telephone, radio and television signals across the oceans.
选项
A、A person who is awake early.
B、A bird that catches the worm early in the morning.
C、A plane which flies in the morning.
D、A communications satellite in orbit round the earth.
答案
D
解析
转载请注明原文地址:https://kaotiyun.com/show/URj7777K
0
大学英语四级
相关试题推荐
Nottoomanydecadesagoitseemed"obvious"bothtothegeneralpublicandtosociologiststhatmodernsocietyhaschangedpeop
Thepassagesummarizesharmfuleffectsofanimalexperiment.However,asanimalexperimentisindispensableinanumberofareas
A、Becausehearinglosscannotberecovered.B、Becausehearinglossmaycauseotherdiseases.C、BecausehalfofAmericanstudent
A、Harmthatcannotberepaired.B、Harmthataremorepowerfulthesedays.C、Damagethatcanberepaired.D、Harmthatarelegaliz
WhenmenreturnedfromWorldWarIIandthepostwar"babyboom"began,Americansbegantomoveingreatnumberstothe【B1】______
A、Whentherearemorethantwelvepeople.B、Whentherearefivepeople.C、Whentherearefifteenpeople.D、Whentherearemoret
A、Itisnotasdifficultasshehadthoughtitwouldbe.B、Shewouldlikeherprofessortoexplainitmoreclearly.C、Shetooka
we__________(本来不必叫邻居帮忙)yesterday,becauseweactuallyhadenoughhands.
ComputersConcernYouWhenCharlesBabbage,aprofessorofmathematicsatCambridgeUniversity,inventedthefirstcalculati
A、Hethinksitnotdirty.B、Hefeelsverybad.C、Heisverytired.D、Hehasnotime.C
随机试题
咳嗽,咯痰黄稠,口干咽痛,发热微恶风寒,舌红苔薄黄,脉数者,所属的证候是()(2010年第26题)
企业内部良好的工作环境是培植企业精神的基础,也是弘扬企业精神的重要因素。()
指甲扁平而反凹者多为
剥脱性龈炎与下列哪项因素无关
城市燃气工程不包括()的建设与维修。
理论对于()相当于()对于设计
根据下面材料回答下列小题。2008年上半年贵州农民人均生活现金消费支出为700.92元,考虑价格因素增长5.5%;城镇居民人均生活消费支出为4086.28元,比上年同期名义增长8.46%。支出增加的同时其结构也发生了一些变化。2008年上半年贵州
使用磁卡进行的身份认证属于
Itisnotunusualforchiefexecutivestocollectmillionsofdollarsayearinpay,stockoptions,andbonuses.Inthelastfif
Byeducation,Imeantheinfluenceoftheenvironmentupontheindividualtoproduceapermanentchangeinthehabitsofbehavio
最新回复
(
0
)