For many in the United States, Arab-Americans are an invisible part of the population. Though Arab-Americans as a community have made great contributions to American society in fields from literature to politics to medicine, many Americans know very little about Americans of Arab backgrounds.
Arab history in the United States goes back to the late 1800's when large numbers of Arab immigrants first began making their journey to a land known simply as “Amreeka”.
Historians generally describe Arab immigration to America in two waves. The first wave took place between 1860 and 1924.The first wave consisted of Lebanese and Syrian, and some Egyptian immigrants. These new immigrants, who were mostly Christian, came to America in search of better opportunities. Even the doomed Titanic, which set sail for America in 1912,had close to a hundred Arab passengers aboard. The majority of Arab-Americans today are descendents of the first wave of immigrants; they are the third or more generation Americans.
The second wave of immigrants followed after World War Ⅱ,caused by political unrest in the Middle East. This second wave of immigrants consists of mainly Arab Muslims（穆斯林）and continues to this day.
Arab-Americans make up 3 million of the population in the United States, according to demographers. And quite different from popular belief, 64 percent of them are American-born. Eighty-two percent of Arab-Americans are US citizens.
Arab-Americans are beyond the national average in both education and income. Education is important among Arab-Americans; 82 percent have high school diplomas, 36 percent have bachelor's degrees or higher, and 15 percent have graduate degrees. The-median（中位数的）average income among Arab-Americans is $39,580, which is higher than the US average.

Never try to work when you are very hungry. If you decided to do your homework right after school, you may get something to eat before getting to work. Always do your homework before you get too tired. Don't wait until very late in everything, or your work will seem much harder than it really is.

    If you have more than an hour's work, give yourself a break after an hour. On the other hand, don't break it up so much, or you can't finish anything, you should be able to work at least a half at a time without stopping.

    Don't put it off until the last minute. If you put off doing your homework, you will have it on your mind, and you will not enjoy your free time so much. If you put it off until the end of the week or until right before a test, you will have too much work to do. A little bit each night, enough to keep up with what is happening each day in school, will make you not afraid of the test and get good grades.

Do your homework at the same time every evening. This will help you make it a habit. It will make it easier to do, and it will make your free time more enjoyable, as well.

    How do you spend your spare time? There will be different answers to it. Most people in Poland（波兰）have their own ways of spending free time. They have many different hobbies，which help them to get away from their everyday problems and spend their free time happily.

    Many Polish（波兰的）people like travelling. They always look for new places that they have never been to and add new and exciting experiences to their journey. Some of them like to climb mountains, others like to go to a sea or a lake to swim，because these can make them get exercise and are good for their health.

    Many Polish people also like to do sports in their free time. They are usually crazy about football，and football is regarded as the Polish national sport. Many football tans may support a certain team, so they go to watch every match of the team they support, and they buy many things that have relations with the team. Watching sport and doing it are both good ways to relax.

    In addition, doctors say that doing sports is very good for health. Many people in town, especially young men, often go to the gym to attend the exercise classes to keep fit.

    Welcome to our museum(博物馆). It is free and you can come only with your ID card. We don't ask you for any money, but we have some rules for you.

    First, don't bring any food to the museum. You can't eat in the museum. But you can bring some water to the museum. Second, you can take photos here, but you can't touch (触摸) the things. Third, keep quiet in the museum. Don't talk loudly. Fourth, don't run in the museum. Finally (最后), our museum closes at half past five in the afternoon. Please leave before five and we need thirty minutes to do some cleaning. Have a good time here! Thank you.