题目
CATV CATV is a short way of saying “community antenna(公用天线) television”. But“cable television” is the name most people use. Cable television allows viewers(观众) to receive TV programs that they can not pick up with their ordinary antenna. Television signals do not follow the curve(曲线) of the earth. They travel in straight lines in all directions. Signals from a TV station move towards the horizon(水平线) and then go into space. If you live only a few miles from a TV station, you may get a good picture on your set. But if you live more than 50 miles from a station, you may not get any pictures at all. CATV began in 1948. People in places far from TV stations had to pay for 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 cable 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 report, 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 ordinary antenna cannot see. It is also used in many classrooms throughout the country. 根据短文内容，选择正确答案。 1.From the first paragraph we know that ________.A.most people use cable televisionB.“community antenna television” is used for cable televisionC.a community antenna is used for cable television D.an ordinary antenna can not pick up TV programs2.Of the following, which is not the way TV signals travel? A.In a curve. B.In a straight line. C.In all directions. D.Towards the horizon.3.Cable TV is becoming more and more popular because ________. A.it is free of charge B.it provides all TV users good pictures C.it only needs a bit of cable D.it can provide more programs4.On the whole, this passage is about ________. A.how to put up high antennas B.a way of picking up better TV programs C.how to use the empty channels on your TV set D.the way that TV signals are sent5.From the passage we can infer(推测) that ________. A.TV has begun to be used for educational purpose(目的) B.viewers can receive more TV programs with their ordinary antennas C.cabel TV can not be used in small towns D.antennas for cable TV are usually put up in the center of a community
CATV
CATV is a short way of saying “community antenna(公用天线) television”. But“cable television” is the name most people use. Cable television allows viewers(观众) to receive TV programs that they can not pick up with their ordinary antenna.
Television signals do not follow the curve(曲线) of the earth. They travel in straight lines in all directions. Signals from a TV station move towards the horizon(水平线) and then go into space. If you live only a few miles from a TV station, you may get a good picture on your set. But if you live more than 50 miles from a station, you may not get any pictures at all.
CATV began in 1948. People in places far from TV stations had to pay for 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 cable 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 report, 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 ordinary antenna cannot see. It is also used in many classrooms throughout the country.
根据短文内容，选择正确答案。
1.From the first paragraph we know that ________.
- A.most people use cable television
B.“community antenna television” is used for cable television
C.a community antenna is used for cable television
- D.an ordinary antenna can not pick up TV programs
2.Of the following, which is not the way TV signals travel?
- A.In a curve.
- B.In a straight line.
- C.In all directions.
- D.Towards the horizon.
3.Cable TV is becoming more and more popular because ________.
- A.it is free of charge
- B.it provides all TV users good pictures
- C.it only needs a bit of cable
- D.it can provide more programs
4.On the whole, this passage is about ________.
- A.how to put up high antennas
- B.a way of picking up better TV programs
- C.how to use the empty channels on your TV set
- D.the way that TV signals are sent
5.From the passage we can infer(推测) that ________.
- A.TV has begun to be used for educational purpose(目的)
- B.viewers can receive more TV programs with their ordinary antennas
- C.cabel TV can not be used in small towns
- D.antennas for cable TV are usually put up in the center of a community
题目解答
答案
1.C
2.A
3.D
4.B
5.A
解析
步骤 1：理解CATV的定义
CATV是“community antenna television”的缩写，即“公用天线电视”，也被称为“有线电视”。有线电视允许观众接收他们用普通天线无法接收到的电视节目。
步骤 2：理解电视信号的传播方式
电视信号不遵循地球的曲线，而是以直线方式向各个方向传播。信号从电视站向地平线移动，然后进入太空。如果观众离电视站很近，他们可能会收到很好的画面。但如果离电视站超过50英里，他们可能根本收不到任何画面。
步骤 3：理解CATV的起源和工作原理
CATV始于1948年，远距离的观众需要支付安装高天线的费用。社区天线通常放置在山上、山丘或高塔上。天线接收电视信号并将其输入到小型本地站。从那里，称为电缆的粗线延伸到附近的家庭。使用电缆的每个人每月支付费用。
步骤 4：理解CATV的扩展应用
CATV运行良好，很快找到了新的用途。本地站可以将节目输入未使用的空闲频道。电缆沿线的人们可以免费获得本地新闻、天气预报、农场和学校新闻。
步骤 5：理解CATV在城市中的应用
如今，有线电视已进入城市。它带来了城市观众用普通天线无法看到的额外节目。它还被用于全国许多教室。
CATV是“community antenna television”的缩写，即“公用天线电视”，也被称为“有线电视”。有线电视允许观众接收他们用普通天线无法接收到的电视节目。
步骤 2：理解电视信号的传播方式
电视信号不遵循地球的曲线，而是以直线方式向各个方向传播。信号从电视站向地平线移动，然后进入太空。如果观众离电视站很近，他们可能会收到很好的画面。但如果离电视站超过50英里，他们可能根本收不到任何画面。
步骤 3：理解CATV的起源和工作原理
CATV始于1948年，远距离的观众需要支付安装高天线的费用。社区天线通常放置在山上、山丘或高塔上。天线接收电视信号并将其输入到小型本地站。从那里，称为电缆的粗线延伸到附近的家庭。使用电缆的每个人每月支付费用。
步骤 4：理解CATV的扩展应用
CATV运行良好，很快找到了新的用途。本地站可以将节目输入未使用的空闲频道。电缆沿线的人们可以免费获得本地新闻、天气预报、农场和学校新闻。
步骤 5：理解CATV在城市中的应用
如今，有线电视已进入城市。它带来了城市观众用普通天线无法看到的额外节目。它还被用于全国许多教室。