首页
登录
职称英语
[originaltext] CATV is a short way of saying "community antenna television."
[originaltext] CATV is a short way of saying "community antenna television."
游客
2023-07-08
56
管理
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://tihaiku.com/zcyy/2819587.html
相关试题推荐
[originaltext]Topofficialsincity,stateandthefederalgovernmentsare
[originaltext]"Whereistheuniversity?"isaquestionmanyvisitorstoCam
[originaltext]Ittakesmorethangoodlookstobeanairhostess.Brainswi
[originaltext]M:Timetoeat!W:Coming.Oh,I’mstarving.M:Good,good.W:Oh
[originaltext]M:Timetoeat!W:Coming.Oh,I’mstarving.M:Good,good.W:Oh
[originaltext]M:Ihearthatthemake-upinBeijingoperaisalmostanartform
[originaltext]M:Ihearthatthemake-upinBeijingoperaisalmostanartform
[originaltext]M:Ihearthatthemake-upinBeijingoperaisalmostanartform
[originaltext]W:Son,Idon’tknowwhattogetforyourfather.Hehasaboutev
[originaltext]W:Son,Idon’tknowwhattogetforyourfather.Hehasaboutev
随机试题
Goodmorning,everyoneandwelcometotheEnglishforAcademicPurposesCent
下图为“某特大城市中心商务区白天人口与夜间人口密度变化图”。白天人口主要指工作人
( )拟定后应由相关法律人员审核,销售人员必须了解各种手续的流程及相关条件,并
患者,女,65岁。阴道分泌物增多伴出血3个月。经宫颈病理等检查临床诊断为宫颈鳞状
护士在从事护理工作时,首要的义务是A.维护患者利益 B.维护护士的利益 C.
对于干式电抗器安装,绕组绕向应满足(____)。(A)三相垂直排列时,中间相与上
2002-115.癫狂的表现是 A.沉默痴呆,语无伦次,静而多喜B.
中国期货业协会制定的以下期货从业人员自律管理的具体办法,须报中国证监会核准的有(
通过( )是我国客户最主要的下单方式。A.微信下单 B.电话下单 C.互联
患某,男,62岁,近期时常外出时找不到回家的路,对较早以前发生的事情记忆较好,但
最新回复
(
0
)