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
2024-02-09
15
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/3435853.html
相关试题推荐
[originaltext]WhenIwasgrowingupinAmerica,Iwasashamedofmymother’
[originaltext]WhenIwasgrowingupinAmerica,Iwasashamedofmymother’
[originaltext]BobbyMoorewasafamousEnglishsoccerplayerwholedtheEn
[originaltext]W:Oh,Ken,Ihavebeenmeaningtotalktoyou.M:Hi,Denise!Wh
[originaltext]W:Oh,Ken,Ihavebeenmeaningtotalktoyou.M:Hi,Denise!Wh
[originaltext]W:Oh,Ken,Ihavebeenmeaningtotalktoyou.M:Hi,Denise!Wh
[originaltext]M:Wanttogooutandgetsomethingtoeat?W:Ican’t.Ihavea
[originaltext]W:Hey,I’vemanagedtogetanextraticketfortheconcertthis
[originaltext]Americansusuallyconsiderthemselvesafriendlypeople.Their
[originaltext]Ifyouaresomeonewhotendstofocusonthenegative,[31]th
随机试题
Whatisthepassagemainlyabout?[br]Itissuggestedinthelastparagraphtha
HowtoUsetheLibraryThebooksinalibrary
Afour-yearstudybysociologistsatTheUniversityofManchesterhasfound
Thepopularnotionthatolderpeopleneedlesssleepthanyoungeradultsisamy
用于填石路基的填料,要求石料强度(饱水试件极限抗压强度)不小于()。A、5MP
影响进度目标实现的主要因素归纳起来有()。A:施工条件不利 B:不可抗力
某老师很少留意成绩一般的学生,把自己的精力用于培养优秀的学生。该老师的做法( )
采用工程技术措施消除和降低粉尘危害是预防尘肺的根本措施,对于石材加工企业,在切割
下列材料,可用于防止路面反射裂缝的有()。A.土工格栅 B.油毛毡 C.塑
承包商管理人员和一般技工的能力方面的风险属于()类型。A.经济与管理风险 B
最新回复
(
0
)