首页
登录
职称英语
What does the speaker say about television signals? [br] [originaltext] CAT
What does the speaker say about television signals? [br] [originaltext] CAT
游客
2023-07-25
28
管理
问题
What does the speaker say about television signals? [br]
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.
选项
A、All classrooms use cable television.
B、City people can see extra programs.
C、The charge of cable is much lowered.
D、TV signals can be received more easily.
答案
B
解析
短文提到,有线电视进入城市后,给城市观众带来了普通天线无法提供的额外节目,故B正确。
转载请注明原文地址:https://tihaiku.com/zcyy/2868204.html
相关试题推荐
[originaltext]Whencarsfirststartedappearingonthestreetsoftheworld
[originaltext]Whencarsfirststartedappearingonthestreetsoftheworld
[originaltext]M:Howareyournewneighbors,Nancy?W:Theyseemniceenough,b
[originaltext]M:Howareyournewneighbors,Nancy?W:Theyseemniceenough,b
[originaltext]Janet’ssisterisastewardessinafamousinternationalairl
[originaltext]M:Hi,Janet,youaresoluckytobedonewithyourfinalexamsa
[originaltext]M:Hi,Janet,youaresoluckytobedonewithyourfinalexamsa
[originaltext]W:You’restillsmoking!Afterpromisingtogiveitupsixmonths
[originaltext]W:You’restillsmoking!Afterpromisingtogiveitupsixmonths
[originaltext]W:You’restillsmoking!Afterpromisingtogiveitupsixmonths
随机试题
Itisnecessarytohaveagoodunderstandingofallthetermsandconditionsbef
BritishCuisine:theBestofOldandNewBritishcuisine(烹饪
(1)Iknownowthatthemanwhosatwithmeontheoldwoodenstairsthatho
男性,8岁,发热腹痛1天,腹泻10次,嗜睡,抽搐2次入院。体检:T40℃,昏迷,
Thechangeinthatvillagewasmiraculou
当完成市场分析和其他前期研究工作并进行了项目评估之后,就要进入实施过程,而实施过
根据ICD-10,抑郁症的诊断要点是()。(2008-11)A:注意力集中困难
在110kV及220kV系统中,开断空载架空线路的过电压不超过(),开断电缆线路
子宫肌瘤最常见的并发症是A、红色变性 B、继发性贫血 C、浆膜下肌瘤蒂扭转
溃疡病外科治疗的理论基础最终在于A、消除分泌胃蛋白酶原——主细胞 B、消除分泌
最新回复
(
0
)