In Europe, small cars have always been more popular than large cars. In the United States, large cars and midsize cars are more popular than smaller cars. As a result, European automakers used to make different kinds of small cars while American automakers used to build bigger, heavier cars. However, these days, automakers in both America and Europe produce cars of different sizes. This is because most automakers export their cars all over the world.

    The price of gasoline (汽油)is one reason for differences in car choices. Since gasoline is more expensive in Europe, many Europeans want smaller, lighter cars that will travel a long way on a gallon（加仑）of gasoline.

    Other reasons also enter into the big or little car decision. Many European cities have narrow, winding（弯曲的） streets. In these cities a small car is easier to control than a large one.

    For a long time, few Americans bought small cars. Instead they chose large cars, because these roomy cars were more comfortable for large families and long trips. Some people also liked the powerful engines（发动机） that large cars had. Since gasoline was cheap, drivers did not mind that the large cars used a lot of gasoline.

    But in the 1970s, there were gasoline shortages in the United States. The price of gasoline went up. Though large cars were still more popular than smaller cars, sales of small cars increased. Some people also bought small cars because these cars caused less air pollution than larger cars.

    Today, Americans' car preferences are still changing. Though Americans are still buying many small cars, the fastest growing sales are for certain kinds of large cars. These types of cars are called minivans and sport utility vehicles(SUV). They are very popular today. But of course, that could change tomorrow.

    Different countries have different customs(风俗) in the world. It's very important for us to know about them.

    When you go to the US, someone often says to you "give me five". What should you do? Do not get five dollars from your pocket! It will make others laugh! The person is not asking for your money, but your fingers.

    In the US, "give me five" or "give me the high five" is a popular gesture. You can see it often in films or on TV. It means hitting(敲打) each other's right hands together.

    People do it when they meet for the first time or something happy happens. For example, a student good grades in exams. If a football teams wins a game, the players will give high fives to everyone around to celebrate.

    This gesture may come from the old Roman gesture of raising the right arm for the empor. This showed the person raising his arm did not have a knife in his hand.

    Why not try to give the high five to your friends?

China is the hometown of tea.Before the Tang Dynasty，Chinese tea was sold by land and sea，first to Japan and South Korea

It is said that Chinese tea was discovered by Shen Nong.People say that he lived 5，000 years ago.One summer day，while he was visiting a faraway part of his country，so he began to boil（煮沸） water for himself to drink.Some dry leaves from a near plant fell into the water.Shen Nong drank some，Shen Nong was interested in the new drink.And so，tea was created in 2737 BC.

Drinking tea has many advantages（优势）.It makes people feel less tired，drives heat inside the human bodies out and helps people lose weight.As you add a cup of tea to your daily life

•Drink it hot.Tea oxidizes（氧化） quickly，so you had better drink it hot.

• Do not drink too much strong tea.It will probably be bad for your stomach and make you feel sick if you make the tea too strong.

•The best time to drink tea is between meals.It may not make you have a strong wish to eat when your stomach is empty，or cause a stomachache when your stomach is full.

•Do not drink tea with any medicine.It may change the medical result.You can drink tea two hours after you take medicine.

•Green tea is the best choice for office workers.Why？Because green tea can help stop some bad results caused by the computer.