A. They are on the west of the Hudson River.

　　B. They are very high and beautiful in this area.

　　C. They can be seen from the Appalachian family.

　　D. They gather beautiful clouds in blue and purple.

　　答案:答案:答案:答案:答案:答案:答案:assage 4(典型例题海卷)

　　Transportation and communication networks bring people together. Yet sometimes people themselves create barriers (障碍) to transportation and communication. In some countries, laws stop people from moving freely from place to place. Over the centuries, many groups of people have been denied the freedom to travel because of their race, religion, or nationality. In the Middle Ages, for example, Jews were often forbidden to move about freely within certain cities. South Africa's government used to require black Africans to carry passes when they travel within the country. Some governments require all citizens to carry identification papers and to report to government officials whenever they move.

　　Countries set up customs posts at their borders. Foreign travellers must go through a customs inspection before they are allowed to travel in the country. Usually travellers have to carry special papers such as passports and visas (签证).

　　Some countries even limit the number of visitors to their country each year. Others allow tourists to visit only certain areas of the country, or they may require that travellers be with an official guide at all times during their stay.

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