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  3. Telecommunications allows people around the World to contact one another, to

Telecommunications allows people around the World to contact one another, to

游客2024-06-30  14
问题    Telecommunications allows people around the World to contact one another, to access information instantly, and to communicate from remote areas. Telecommunications usually involves a sender of information and one or more recipients(收件人) linked by a technology, such as a telephone system, that transmits information from one place to another. Telecommunications devices convert different types of information, such as sound and video, into electronic signals. The signals can then be transmitted by means of media such as telephone wires or radio waves. When a signal reaches its destination, the device on the receiving end converts the electronic signal back into an understandable message, such as sound over a telephone, moving images on a television, or words and pictures on a computer screen. Telecommunications enables people to send and receive personal messages across town, between countries, and to and from outer space. It also provides the key medium for news, data, information’ and entertainment.
   Telecommunications messages can be sent in a variety of ways and by a wide range of devices. The messages can be sent from one sender to a single receiver (point-to-point) or from one sender to many receivers (point-to-multipoint). Personal communications, such as a telephone conversation between two people or a facsimile (fax) message, usually involve point-to-point transmission. Point-to-multipoint telecommunications, often called broadcasts, provide the basis for commercial radio and television programming.
选项 A、Telecommunications are devices and systems that transmit electronic signals across long distances.
B、Telecommunications allows people around the world to contact one another, to access information instantly, and to communicate from remote areas.
C、Telecommunications usually involves a sender of information and one or more recipients(收件人) linked by a technology.
D、Telecommunications are devices and systems that carry, electronic signals across short distances.
答案 A
解析 首先要明确提问，即要给“communication” 下一个定义。根据文章的整体内容来看；B项是文章的第一句话，不能称之为“communication”的定义；C项也是文章第一段中的原句，故排除。A项和C项有着相似之处，唯一不同的是一个是“across long distances”；一个是“across short distances”. 然后据文章内容推出A项正确。
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