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
2016-08-25
42
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://jikaoti.com/ti/zSpFFFFM
0
大学英语四级
相关试题推荐
Anewstudyshowsthatstudentslearnmuchbetterthroughanactive,iterative(反复的)processthatinvolvesworkingthroughtheirm
TheArtofFriendshipA)OneeveningafewyearsagoIfoundmyselfinananxiety.Nothingwasreallywrong—myfamilyandIwere
StudentexpeditionsdoagreatdealofgoodworkontheArcticislandsbutfromtimetotimecausetroubleinthehuts,probably
Parents’Homework:FindPerfectTeachersforKidsA)TomiHalldidwhatshecouldtolobbyforthebestteachersforhertwochil
A、Themanisfondoftraveling.B、Thewomanisaphotographer.C、Thewomantookalotofpicturesatthecontest.D、Themanadmi
GeorgeDanielslivesinLondon.Heisawatchmaker.Hisworkcontinuesthe【B1】_______oftheEnglishwatchmakersofthe18thand
A、Becausetheirnumberisgrowingandtheyaremoreactive.B、Becauseseniorcitizenshavemoreexperiencethanothers.C、Becaus
Driver’sLicenseTestTipsA)Thisarticlewillprovideyouwithsomesimpletipsforpassingyourdriver’slicensetest.Adequat
CaliforniaStateLawrequiresthatallbicycleridersunderage18wearprotectivehelmetswhenevertheyrideonpublicstreets
Inthecenterofabigcitythereareusuallydozensoflargeofficebuildingsthathousebigbanks,corporationheadquarters,a
随机试题
下列说法中不正确的是()。
私募股权投资最早在()地区产生并得到发展。
关于小脑出血,正确的是
男性,32岁,2年来大便不规则伴粘液血丝。半年来右上腹闷痛不适,大便稀薄不成形,2次/日。一个月来苍白,疲倦乏力,头晕、消瘦。三天来腹痛加剧伴发热至39~39.5℃,无咳嗽。Hb80g/L,WBC21×109/L,N0.80,L0.14,E0.
小儿肺炎合并心力衰竭是由于肺动脉高压和哪种病因共同作用的结果
药品出、入库要严格执行能做到分类定位、整齐存放,并具备冷藏、避光、防潮、防风、防鼠等仓储条件的是
动用期货投资者保障基金对期货投资者的保证金损失进行补偿后,()依法获得相应的受偿权,可以依法参与期货公司清算。
可转换公司债券的转股期限越长,转股权价值就越大,可转换公司债券的价值越高。( )
出入库频率高的商品要尽量靠近出口,减少作业量。
Hostelbuildingsvaryfromcottagetocastle.Mosthavebeenadaptedtohostelusethoughsomehavebeenspeciallybuiltforthe
最新回复
(
0
)