作业帮catv 求详解
来源：学生作业帮 编辑：拍题作业网作业帮 分类：英语作业 时间：2024/06/11 22:40:18
Passage 1
CATV is a short way of saying "community antenna (天线) 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 (曲线) of the earth. They travel in straight lines in all directions. Signals from a TV station move toward the horizon (水平线) 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. 1. From the first paragraph we know that ________.
○A. most people use cable television
○B. "community antenna" is another name for "regular antenna"
○C. a community antenna is used for cable television
○D. regular antennas cannot pick up TV signals 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 direction.
○D. Toward the horizon.
3. Cable TV is becoming more and popular because _____________.
○A. it is free of charge
○B. it can provide more programs
○C. it provides all TV users good pictures
○D. TV sets with regular antennas can also have a good reception through CATV
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 that __________.
○A. TV has begun to be used for educational purposes
○B. there is no charge for CATV
○C. cable TV cannot be used in mountainous areas
○D. antennas for cable TV are usually put up in the center of a community
CATV is a short way of saying "community antenna (天线) 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 (曲线) of the earth. They travel in straight lines in all directions. Signals from a TV station move toward the horizon (水平线) 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. 1. From the first paragraph we know that ________.
○A. most people use cable television
○B. "community antenna" is another name for "regular antenna"
○C. a community antenna is used for cable television
○D. regular antennas cannot pick up TV signals 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 direction.
○D. Toward the horizon.
3. Cable TV is becoming more and popular because _____________.
○A. it is free of charge
○B. it can provide more programs
○C. it provides all TV users good pictures
○D. TV sets with regular antennas can also have a good reception through CATV
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 that __________.
○A. TV has begun to be used for educational purposes
○B. there is no charge for CATV
○C. cable TV cannot be used in mountainous areas
○D. antennas for cable TV are usually put up in the center of a community
解题思路： 如下
解题过程：
Keys: CADBA
CATV是“community antenna television”的缩写，但是“cable television”是用的最多的名字，有线电视使观众能够收到用他们的普通天线接收不到的电视节目。
电视信号不遵循地球的曲线，他们沿各个方向的直线运传播，一个电视台的信号向地面移动然后射入太空。如果你居住的地方离电视台很近，在你的屏幕上就会显示很清晰的图像。但如果你居住的地方离电视台超过50英里，那么你将得不到任何图像。
CATV开始于1948年，住的离电视台较远的人不得不为搭高天线花钱。一个社区的天线经常安置在山坡上、山上、或者高塔上，天线接收到信号然后把他们传递到地方电视台。从这个电视台发出的粗电线即电缆把信号传给附近的居民，使用这些电缆的每人每月都要缴费。
CATV运行很好，并且不久又找到了新的用途，地方电视台可以把节目放在没有使用的空的频道。使用电缆的人可以免费收到当地新闻、天气预报、农场和学校的消息。
今天，有线电视已进入到诚实。它让城市的观众收到用普通天线收不到的节目，并且也在全国的教室中投入使用。
最终答案：略
解题过程：
Keys: CADBA
CATV是“community antenna television”的缩写，但是“cable television”是用的最多的名字，有线电视使观众能够收到用他们的普通天线接收不到的电视节目。
电视信号不遵循地球的曲线，他们沿各个方向的直线运传播，一个电视台的信号向地面移动然后射入太空。如果你居住的地方离电视台很近，在你的屏幕上就会显示很清晰的图像。但如果你居住的地方离电视台超过50英里，那么你将得不到任何图像。
CATV开始于1948年，住的离电视台较远的人不得不为搭高天线花钱。一个社区的天线经常安置在山坡上、山上、或者高塔上，天线接收到信号然后把他们传递到地方电视台。从这个电视台发出的粗电线即电缆把信号传给附近的居民，使用这些电缆的每人每月都要缴费。
CATV运行很好，并且不久又找到了新的用途，地方电视台可以把节目放在没有使用的空的频道。使用电缆的人可以免费收到当地新闻、天气预报、农场和学校的消息。
今天，有线电视已进入到诚实。它让城市的观众收到用普通天线收不到的节目，并且也在全国的教室中投入使用。
最终答案：略