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
45
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
【B1】[br]【B20】A、copingB、involvingC、dealingD、handlingDhandle意为“应付,对付”。
(1)Mostpeopledreamenthusiasticallyatnight,theirdreamsseeminglyoccup
Wherearethespeakers?[br][originaltext]W:Expressserviceisprobablythef
以下关于软件需求分析、设计、测试与维护的叙述中,不正确的是()。A.软件需
牙隐裂的临床表现之一是A.裂不越过边嵴 B.裂与窝沟重叠 C.隐裂明显可见
两阶段招标主要适用于()的咨询服务招标。A:咨询服务要求时间紧 B:能够提供
符合硅结节的描述是A.早期是纤维结节 B.属肉芽肿病变 C.不发生坏死 D
下列关于肝素类药物的抗凝血作用描述正确的是A.仅在体内有效 B.仅在体外有效
目前用于临床制作种植体的材料均为A.金 B.银 C.钛 D.不锈钢 E.
一台正在运行的蒸汽锅炉,运行人员发现锅炉水位表内出现泡沫。汽水界限难以区分,过热
最新回复
(
0
)