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
2023-06-25
58
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/2781717.html
相关试题推荐
[originaltext]Anewstudyfoundthat43percentofboyandgirlparticipant
[originaltext]Anewstudyfoundthat43percentofboyandgirlparticipant
[originaltext]Peoplewithbiggerbrainstendtoscorehigheronstandardte
[originaltext]Peoplewithbiggerbrainstendtoscorehigheronstandardte
[originaltext]Iliveinasmallvillageinthecountry.MywifeandIrunt
[originaltext]Iliveinasmallvillageinthecountry.MywifeandIrunt
[originaltext]W:Goodafternoon,Mr.Burke.Didyouhaveagoodlunch?M:Yes,
[originaltext]W:Goodafternoon,Mr.Burke.Didyouhaveagoodlunch?M:Yes,
[originaltext]M:Hello.Ineedtotalkwithsomeoneaboutmydriver’slicense.
[originaltext]Fifteenyearsago,Japaneseengineersastonishedtheworldwi
随机试题
Globalaveragetemperaturesaresettoriseby1°Cabovepre-industriallevel
某工程单代号网络计划如下图所示(图中节点上方数字为节点编号),其中关键线路有(
宪法解释一般要遵循以下原则:()A.四项基本原则 B.法治原则 C.系统解释
已发生的采购交易均已记录的关键内部控制不包括( )。A、采购经适当级别批准 B
作为一种竞争战略,市场定位的主要方式有( )。A.产品定位 B.避强定位
提交勘察成果资料后()d内,发包人应一次付清全部勘察费用。A、7B、10C、
能漂白毛发,不宜用在有毛发部位的药物()A.异维A酸 B.维A酸 C.阿
设备安装工程概算编制方法主要有()。A.预算单价法 B.定额指标法 C.扩大
(2014年真题)施工合同实施偏差分析的内容包括:产生合同偏差的原因分析,合同实
施工质量事故处理的依据有()。A.施工记录、施工日志 B.有关的技术文件和档案
最新回复
(
0
)