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.

This passage is mainly to remind American citizens of（　）

A:the importance of applying for a passport and visa B:safety regulations for visiting other countries C:the limitations to traveling around the world D:the requirements for their traveling abroad

Men have traveled ever since they first appeared on the earth.
In primitive times they did not travel for pleasure but to find new places where their herds could feed, or to escape from hostile neighbors, or to find more favorable climates. They traveled on foot. Their journeys were long, tiring, and often dangerous. They protected themselves with simple weapons, such as wooden sticks or stone clubs, and by lighting fires at night and, above all, by keeping together.
Being intelligent and creative, they soon discovered easier ways of traveling. They rode on the backs of their domesticated animals; they hollowed out tree trunks and, by using bits of wood as paddles, were able to travel across water.
Later they traveled, not from necessity, but for the joy and excitement of seeing and experiencing new things. This is still the main reason why we travel today.
Traveling, of course, has now become a highly organized business. There are cars and splendid roads, express trains, huge ships and jet airliners, all of which provide us with comforts and security. This sounds wonderful. But there are difficulties. If you want to go abroad, you need a passport and a visa, ticket, luggage, and a hundred of other things. If you lose any of them, your journey may be ruined.

Traveling has now become a highly organized business （　）

A:so we can travel anywhere without difficulty B:because we are provided with all kinds of convenient means for traveling C:because traveling organizations can be found in the countries the world over D:so travelers have increased rapidly

Passage Two
Men have traveled ever since they first appeared on the earth.
In primitive times they did not travel for pleasure but to find new places where their herds could feed, or to escape from hostile neighbors, or to find more favorable climates. They traveled on foot. Their journeys were tong, tiring, and often dangerous. They protected themselves with simple weapons, such as wooden sticks or stone clubs, and by lighting fires at night and, above all, by keeping together.
Being intelligent and creative, they soon discovered easier ways of traveling. They rode on the backs of their domesticated animals; they hollowed Out tree trunks and,’ by using bits of wood as paddles, were able to travel across water.
Later they traveled, not from necessity, but for the joy and excitement of seeing and experiencing new things, This is still the main reason why we travel today.
Traveling, of course, has now become a highly organized business. There are cars and splendid roads, express trains, huge ships and jet airliners, all of which provide us with comforts and security. This sounds wonderful. But there are difficulties. If you want to go abroad, you need a passport and a visa, ticket; luggage, and a hundred of other things. If you lose any of them, your journey may be ruined.

Traveling has now become a highly organized business（）

A:so we can travel anywhere without difficulty B:because we are provided with all kinds of convenient means for traveling C:because traveling organizations can be found in the countries the world over D:so travelers have increased rapidly

It usually takes much (less) time to fly from one country to (another) than (traveling) (by) train.

A:less B:another C:traveling D:by

Passage Two Men have traveled ever since they first appeared on the earth. In primitive times they did not travel for pleasure but to find new places where their herds could feed, or to escape from hostile neighbors, or to find more favorable climates. They traveled on foot. Their journeys were tong, tiring, and often dangerous. They protected themselves with simple weapons, such as wooden sticks or stone clubs, and by lighting fires at night and, above all, by keeping together. Being intelligent and creative, they soon discovered easier ways of traveling. They rode on the backs of their domesticated animals; they hollowed Out tree trunks and,’ by using bits of wood as paddles, were able to travel across water. Later they traveled, not from necessity, but for the joy and excitement of seeing and experiencing new things, This is still the main reason why we travel today. Traveling, of course, has now become a highly organized business. There are cars and splendid roads, express trains, huge ships and jet airliners, all of which provide us with comforts and security. This sounds wonderful. But there are difficulties. If you want to go abroad, you need a passport and a visa, ticket; luggage, and a hundred of other things. If you lose any of them, your journey may be ruined.

Traveling has now become a highly organized business（）

A:so we can travel anywhere without difficulty B:because we are provided with all kinds of convenient means for traveling C:because traveling organizations can be found in the countries the world over D:so travelers have increased rapidly

Food is one of the most pleasurable things in life, but may he the most terrible thing when you’re traveling with kids. When kids get hungry, they get noisy, and no matter where you are, it’s no fun. Food is also a big part of travel expenses for a family. Eating out in restaurants all the time can cost a lot of money and no kids want to wait for a long time to eat a meal. Here are some tips to help you to have fun and save money. Start the day right. Breakfast can be a simple matter. To save money, if you’re traveling by car, bring breakfast with you, or shop in a supermarket after you check into your hotel. Many hotels have fridges, so all you need is milk, juice, fruit, bread, cups and plastic containers.
After eating in your room, breakfast is out of the way. When you leave your hotel, you’re ready to start sightseeing. Have picnics. Picnics are fun for everyone in the family. You don’t need to wait for a long time for food to be served, or keep telling your kids to behave. Whatever you’re eating, it tastes delicious. Afterwards you can relax while the kids run around. You can have a picnic anywhere-in a grassy city park, at the seaside, sitting next to a stream. And picnics aren’t for lunch only-bring a picnic to the beach at sunset. You can have a picnic wherever you are, even in a big city, and picnics don’t cost much! Buying your picnic is part of the fun and you can shop to please everyone’s tastes in your family. Supermarkets are open day and night, and usually have a deli(熟食店) where you can have everything you need for a picnic.
Which of the following is the best title tot the passage

A:How to Shop at a Supermarket B:Tips for Eating Out While Traveling C:How to Have a Perfect Picnic D:Tips for Traveling with Kids

? ?The name Sahara derives from the Arabic word for "desert" or "steppe". At 3. 5 million square miles, an area roughly the size of the United States, the Sahara Desert in northern Africa is the largest desert in the world. It spans the continent from the Atlantic Ocean to the Red Sea. Daytime temperatures can reach as high as 130~F. The humidity sometimes gets into the teens. But it can also be as low as 2.5 percent, the lowest in the world. Most of the Sahara reeeives less than five inches of rain per year, while large areas sometimes have no rainfall at all for years.
? ?At the heart of the Sahara is the landlocked north African country of Niger. Here the sand dunes can be 100 feet tall and several miles long. Here sand plains stretch over an area larger than Germany where there is neither water nor towns. Yet sitting in the midst of the surrounding desert is the town of Bilma. Suddenly there are pools of clear water. Surprisingly, there are groves of date palms. Underground water resources, or oases, sufficient to support irrigated agriculture are found in dry stream beds and depressions. Irrigation ditches run off a creek to water fields. Corn, cassava, tea, peanuts, hot peppers, and orange, lime, and grapefruit trees grow in these fields. Donkeys and goats graze on green grass.
? ?The Sahara of Niger is still a region where you can see a camel caravan of 500 camels tied together in loose lines as long as a mile, traveling toward such oasis towns. There a caravan will collect life-sustaining salt, which is mined from watery basins, and transport it up to 400 miles back to settlements on the edges of the desert. The round trip across the vast sands takes one month.

In this passage "caravan" means______

A:railroad train B:a small, fast sailing ship C:traveling circus D:group traveling together through difficult country