Whether you are an American citizen or a foreign national living in the United States, travel abroad requires preparation. Trave

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问题     Whether you are an American citizen or a foreign national living in the United States, travel abroad requires preparation. Travel may be for the purpose of attending meetings or activities in other countries, visiting families or simply taking a vacation. This page is intended to provide guidance and useful resources.
    What information do U. S. citizens need?
    Depending upon the requirements of the country to be visited, citizens of the United States need to carry a passport that is valid for six months beyond the visit or documented evidence of their citizenship and identity(身份). In addition to a passport, some countries will require a visa. For more information, see Visa and Foreign Entry Requirements.
    Current information on passports is available at the Department of State Passport Services and Information website. There is a new passport requirement for U. S. citizens traveling between the United States and the rest of the Western Hemisphere(半球). For details, see Western Hemisphere Travel Initiative.
    When traveling to some specified countries, U. S. citizens may be subject to restrictions on publishing, the exchange of information, the sponsorship of conferences, etc.
It can be inferred that there are restrictions on publishing when American citizens travel abroad because of______.

选项 A、the limitation of the number of publications
B、the security of the United States
C、the interest of individuals
D、the protection of copyright

答案B

解析 推理判断题。由最后一段内容“When traveling to some specified countries.…”中“一些特殊的国家”可以推出,可能这些国家与美国有利益上的冲突,才被称为“specified countries”,故对图书出版的管制应是为了保护美国的安全。故选B.
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