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  3. Today television is one of the most popular forms of entertainment in the home. Some people in places where television reception

Today television is one of the most popular forms of entertainment in the home. Some people in places where television reception

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问题     Today television is one of the most popular forms of entertainment in the home. Some people in places where television reception is good may think that television has taken the place of radio. Television, however, is actually a kind of radio. It uses special equipment for sending and receiving the picture. The television sound system uses the same type of equipment that is used in other forms of radio.
    Exchanging messages with ships at sea was one of the first uses of radio. Modern radio is still used for this purpose and for communication across oceans. On land the radio provides a means of instant communication even with moving vehicles such as taxicabs or service trucks.
    Radiotelephones are used in many places. Connection with the regular telephone service can be provided for boats, trains, and cars. Isolated places in deserts, forests, and mountainous regions are linked by radiotelephone in many parts of the world. Thus by means of radio people can communicate with others wherever service is provided.
The word "isolated" in the last paragraph means______.
选项 A、sandy and mountainous
B、clean and not polluted
C、without any living things
D、separated or distant
答案D
解析 注意全句的上下文信息：Isolated places in deserts，forests，and mountainous regions are linked by radiotelephone in many parts of the world．前3个选项的内容在这个句子中讲不通或者没有关联或意义。可以推断出，需要用无线电联系的地方属于“偏远的、孤立的”地域。
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