Many of those harriers to travel also act as barriers to communication. When two governments disagree with each other on important matters, they usually do not want their citizens to exchange news or ideas freely. Countries often try to keep military or industrial information secret.

　　Today, people have the ability to travel, to communicate, and to transport goods more quickly and easily than ever be- fore. Natural barriers that were difficult or dangerous to cross a hundred years ago can now be crossed easily. The harriers that people themselves make are not so easy to overcome. But in spite of all the different kinds of barriers, people continue to enjoy travel and the exchange of goods and ideas.

　　1. The examples in Paragraph 2 are used to tell the readers that______.

　　A. people have been allowed to travel freely within the country

　　B. people have not been permitted to travel freely for various reasons

　　C. travellers have to carry special papers such as passports and visas

　　D. customs posts are .necessary at the borders of the countries

　　答案:答案:答案:o easy too ver come．可推断出人为造成的障碍要比天然障碍难以克服。

　　4. Which of the following can serve as the best title of the passage?

　　A. Barriers Made by People

　　B. Functions of Communication

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