首页
登录
职称英语
What does the speaker say about television signals? [originaltext] CATV is a
What does the speaker say about television signals? [originaltext] CATV is a
游客
2023-07-25
55
管理
问题
What does the speaker say about television signals?
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、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:http://tihaiku.com/zcyy/2868202.html
相关试题推荐
[originaltext]ThetraditionalAmericanThanksgivingDaycelebrationgoesba
[originaltext]W:Howdoyougotoschooleveryday?M:Byhike.W:Soyouarel
[originaltext]W:Howdoyougotoschooleveryday?M:Byhike.W:Soyouarel
[originaltext]W:Howdoyougotoschooleveryday?M:Byhike.W:Soyouarel
[originaltext]M:IaskedLindaoutyesterday.W:Ican’tbelieveit!Sheisgor
[originaltext]M:IaskedLindaoutyesterday.W:Ican’tbelieveit!Sheisgor
[originaltext]M:IaskedLindaoutyesterday.W:Ican’tbelieveit!Sheisgor
[originaltext]M:Paulissobusylately.Ineverhaveachancetotalktohima
[originaltext]M:Paulissobusylately.Ineverhaveachancetotalktohima
[originaltext]M:Paulissobusylately.Ineverhaveachancetotalktohima
随机试题
我不知道,通过“心灵之窗”,即眼睛,来深入了解朋友的心是怎么回事。我只能通过我的指尖来“看见”脸部外形。我能够觉察到欢笑,忧伤,以及许多其他的明显的感情
[originaltext]W:Hey,Tom,what’sthatyou’rereading?M:It’saletterfroma
Theeffectofthebabyboomontheschoolshelpedtomakepossibleashifti
唐妆妆面特征中变化最多的部位是________。
以下柱式中哪一个不是古希腊时期创造的?()A.多立克式(Doric) B.
目前,我国应用的死亡标准是()A.心肺与脑死亡 B.心肺死亡 C.呼
刘某,男,53岁。有高血压病史2年,近日情志不遂头痛而眩,心烦易怒,夜眠不宁,两
在下列几种药物中,服用后必须限制饮水的是A.果胶铋 B.阿司匹林 C.氨氯地
大量生产类型的特点是()。A.有一定的生产稳定性、低重复性 B.定期重复轮
A.ac B.pc C.po D.qn E.prn处方中"必要时"的外文
最新回复
(
0
)