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
43
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
[originaltext]W:Hi,Larry,areyouwaitingtoseeProf.Jameson,too?M:Yeah,
现浇钢筋混凝土房屋的抗震等级与以下哪些因素有关?Ⅰ.抗震设防烈度Ⅱ.建筑
在标准层绘制的柱平面布置图上,分别在同一编号的柱中选择一个截面,并将此截面在原位
A.淋法B.洗法C.泡法D.漂法E.润法薄荷多用()。
界线测绘成果的整理不包括()A:文本资料B:地形资料C:数据资料D:图形资
马克思主义关于人的全面发展学说在中国教育界的具体实践是( )。A.教育的国际化
简述信息收集过程中的沟通技巧。
某商场中有一家名为“X手机授权代理商”的店面,宋某在此处以288元的价格更换了其
关于时间知觉,正确的说法包括()。多选A.视觉比触觉估计时间的准确度高 B.
石油天然气油罐区应设置( )系统。A.火灾自动报警 B.水喷雾灭火 C.自
最新回复
(
0
)