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
2024-01-31
55
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.
[16]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. [17]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.
[18]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/3410222.html
相关试题推荐
[originaltext]Evenifyou’vekickedoffafitnessroutineandyou’rechoosi
[originaltext]Evenifyou’vekickedoffafitnessroutineandyou’rechoosi
[originaltext]Listeningtomusicisoneofthemostcommonwayswemanageo
[originaltext]Atfirstglance.EstherOkadeseemslikeanormal10-year-old
[originaltext]Atfirstglance.EstherOkadeseemslikeanormal10-year-old
[originaltext]M:Amelia,youseemverybusynow.ButIdohavesomethingtotel
[originaltext]M:Amelia,youseemverybusynow.ButIdohavesomethingtotel
[originaltext]M:Doyouwanttogooutfordinnertonight?W:Sure.Haveyougo
[originaltext]W:Ifeellikeseeingamovietonight,butIjustcan’tdecidewh
[originaltext]W:Ifeellikeseeingamovietonight,butIjustcan’tdecidewh
随机试题
Whoarethesetwospeakers?[originaltext]W:Excuseme.Canyouhelpmeplease?
Thehumanbraincontains10thousandmillioncellsandeachofthesemayhav
WhichofthefollowingisCORRECT?[br][originaltext]Healthauthoritiesin
对城市可持续性发展的理解,不全面的是( )。A.对资源合理利用、少用不可再生资
A.Ⅲ度深覆 B.手腕部X线片 C.Ⅰ度拥挤 D.Ⅱ度开 E.Ⅱ度深覆盖
细菌哪种结构的功能类似真核细胞的线粒体A.胞质颗粒B.核蛋白体C.质粒D.异染颗
A.丙酮酸B.谷氨酸C.α-酮戊二酸D.甘氨酸E.草酰乙酸代谢时能直接生成一碳单
阅读下面材料,根据要求写作文。 东邻人家的岳母死了,殡葬的时候需要一篇祭文,这
A.5-羟色胺 B.去甲肾上腺素 C.乙酰胆碱 D.多巴胺 E.肾上腺素
亿凡公司与五悦公司签订了一份买卖合同,由亿凡公司向五悦公司供货;五悦公司经连续背
最新回复
(
0
)