When you are in England, you must (必须) be very careful (小心) in the streets because the traffic (交通) drives (行驶) on the left. Before you cross a street, you must look to the right first, and then the left.

In the morning and in the evening when people go to or come back from work, the streets are very busy. Traffic is the most dangerous.

When you go by bus in England, you have to be careful, too. Always remember: the traffic goes on the left. Have a look first, or (否则) you may (可能) go the wrong (错) way.

In many English cities, there are big buses with two floors. You can sit on the second floor. From there you can see the city very well. It’s very interesting.

Welcome to Shanghai! It is a beautiful and modern city in China. It is also one of the biggest cities in the world. There are many tall buildings, great bridges and busy streets everywhere. It isn’t easy for you to find your way if you are new here. Don’t worry! You can read the map first and take the underground to the places you want to visit. It also has lots of taxis in the whole city. You can get to any place by taxi. Walking along the streets, you can realize the city changes very fast.

Shanghai is famous for shopping, eating and travelling. Travelling around Shanghai is cheap and easy. Every year millions of visitors come and enjoy exciting nightlife and beautiful views. If you want to cross the Huangpu River, you can choose taxis, buses, ferries（渡船）or the underground. Going by ferry is the cheapest way. In Shanghai you can taste all kinds of Chinese food. If you want to enjoy different operas, Shanghai Opera House is the best place.

Think about the different ways that people use the wind. You can use it to fly a kite or to sail a boat. Wind is one of our cleanest and richest power sources, as well as one of the oldest. Something shows that windmills (风车) began to be used in ancient Iran (伊朗) back in the seventh century BC. They were first introduced to Europe during the 1100s, when armies returned from the Middle East with knowledge of using wind power.

For many centuries, people used windmills to make wheat (小麦) into flour (面粉) or get water from deep underground. When electricity was discovered in the late 1800s, people living in faraway areas began to use them to produce electricity. This allowed them to have electric lights and radio. However, by the 1940s when electricity was available to people in almost all areas of the United States, windmills were hardly used.

During the 1970s, people started becoming more cared about the pollution that is created when coal and gas are burned to produce electricity. People also realized that the supply of coal and gas would run out one day. Then, wind was rediscovered, though it means higher costs. Today, there is a global movement to supply more and more of our electricity through the use of wind.