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、They travel faster near the TV station. B、They can work better than ever before. C、They usually follow the curve of the earth.
A、They travel faster near the TV station. B、They can work better than ever before. C、They usually follow the curve of the earth.
admin
2019-09-01
20
问题
CATV is a short way of saying "community antenna television." But "cable television" is the term most people use. Cable television allows viewers to receive TV programs that they cannot pick up with their regular antennas.
Television signals do not follow the curve of the earth. They travel in straight lines in all directions. Signals from a TV station move toward the horizon and then go into space. If you live only a few miles from a station, you may not get any picture at all.
CATV began in 1948. People in places far from TV stations shared the cost of putting up high antennas. A community antenna was usually placed on a hill, a mountain, or on a high tower. The antenna picked up TV signals and fed them into a small local station. From the station, thick wires called cables ran out to nearby homes. Each person using the cable paid a monthly charge.
CATV worked well, and soon new uses were found for it. Local stations could feed programs into empty channels that were not in use. People along the cable could have local news, weather reports, and farm and school news at no extra charge.
Today, cable television has moved into cities. It brings in extra programs that city viewers with regular antennas cannot see. It is also used in many classrooms throughout the country.
16 What does the speaker say about television signals?
17 What should people do if they used the cable?
18 What happens after cable television has moved into cities?
选项
A、They travel faster near the TV station.
B、They can work better than ever before.
C、They usually follow the curve of the earth.
D、They travel in straight lines in all directions.
答案
D
解析
短文提到,电视信号不沿地球的曲线传播,而沿直线向四周传播,故D正确。
转载请注明原文地址:https://kaotiyun.com/show/hKZ7777K
0
大学英语四级
相关试题推荐
"Ithurtsmemorethanyou",and"Thisisforyourowngood."Thesearethe【C1】______mymotherusedtomakeyearsagowhenIhad
Tasteissuchasubjectivematterthatwedon’tusuallyconductpreferencetestsforfood.Themostyoucansayaboutanyone’sp
A、Improvethebatteriesofelectriccars.B、Increasethenumberofelectriccars.C、Designanewdeviceforelectriccars.D、Loo
A、Itimprovesone’sbrainfunction.B、Itincreasesone’sbloodflow.C、Itcleansthewaterofthebody’scells.D、Itkeepsonea
A、Theywilltelldriverstheaccidentontheroadahead.B、Theywillreminddriversifthereisonlyalittleoilleft.C、Theyw
A、AllitscustomerswouldgetextramoneyfromHSBC.B、Heapologizedinavideocliponbehalfofhimself.C、Heexplainedwhath
A、Genderequality.B、Women’smarriage.C、Genderdiscrimination.D、Paidmaternityleave.A题目询问联合国刚结束的事件的关注点是什么。新闻首句就讲到联合国刚结束关注性别平
皮影(shadowplay)是中国民间广为流传的道具戏之一。它是借助灯光把雕刻精巧的皮影人映照在屏幕上,由艺人们在幕后操动皮影人,伴以音乐和歌唱,演出一幕幕妙趣横生的皮影戏。皮影戏历史悠久,相传萌芽于汉,发展于唐,至宋已十分兴盛。陕西皮影分东、西路,不仅
Myco-teacherandImetintheparkinglotbeforeschoolandstaredintomycartrunkatthecostumesandpropswehadgathered
A、Measuredamagingnoisesoncampus.B、Makealistofcampusnoises.C、Figureouthowtofightagainstnoise.D、Explaintheconc
随机试题
A.咨询、演讲B.报纸、杂志C.标本、模型D.电影、电视E.书籍属于电子媒介传播的是
第四代计算机的主要逻辑元器件采用的是( )。
黄金作为个人理财产品,可以有以下()投资方式。
一家三口出去旅游,先是去汽车保养公司提车,发生的更换零件的费用是600元,保养的其他费用是200元。然后去洗车,发生费用是50元。早上吃早餐,花费60元,购买一箱矿泉水,花费30元。高速公路收费20元。到海滩,把车存在一个停车场,花费200元。该停车场是由
下列各项审计程序中,可以为未入账应付账款提供审计证据的有()。
正式提出“邓小平理论”这一科学概念,把邓小平理论同马克思列宁主义、毛泽东思想一起,确定为党在一切工作中的指导思想并写入党章的是()
ThereisacommonresponsetoAmericaamongforeignwriters:TheUSisalandofextremeswherethebestofthingsarejustase
Whatdoesthemanmean?
Bacon’s______isthefirstexampleofthatgenreinEnglishliterature,whichhasbeenrecognizedasanimportantlandmarkinthe
A、Chinaisnowabletosupportastronauts’long-termstayinspace.B、Chinahasbeenthetopcountryinthefieldofspace.C、Ch
最新回复
(
0
)