Cars make our lives more convenient. But theycan also be a problem. For example, fossil fuel (化石燃料)cars mainly cause air pollution.

    To improve the environment, many countriesare developing electric vehicles (EVs,电动车).Among them, China is taking a leading role and has created the world's largestEV market.

    Last year, over 40 per cent of the 753,000EVs sold in the world were sold in China, more than twice as many as the numbersold in the United States.

    "Filling up a fossil fuel car with gas(汽油) is more expensive than charging (充电) an electric car," said Wu Hao, who bought an electric carthis year.

    However, there are still some problems. Itcan be hard to find charging piles (充电桩) andthe cars can't go far before being recharged.

    Some of these problems are being solved. In2014, China had 31,000 charging piles. Now China has the world's largest EVcharging network, with more than 450,000 charging piles in total.

    Developing EVs is one of many efforts thatChina has made to cut down pressure on its environment after the governmentpromised to stop increases in carbon dioxide emissions (二氧化碳排放量) by 2030.

    "As China goes, so will the world'scar industry," the Wall Street Journal said.

    Today,roller skating (滑旱冰)is easy and fun. But many years ago, it wasn't easy at all. Before 1743, peoplenever tried skating on wheels. That changed because of a man named John JosephMerlin. Merlin's work was making instruments. In his free time he liked to playthe violin. Merlin was a man with many ideas and many dreams. People called hima dreamer.

    One dayMerlin received an invitation to go to an important party. He was very pleasedand a little excited. As the day of the party came near, Merlin began to think.He wanted to find a way to make a wonderful entrance at the party. Merlin hadan idea. He thought that he would attract a lot of attention if he could skateinto the room.

    Merlintried different ways to make himself roll. Finally, he decided to put twowheels under each shoe. These were the first roller skate shoes. Merlin wasvery proud of them. He dreamed of arriving at the party and skating into theroom while playing the violin. He was sure that everyone would be verysurprised.

    On thenight of the party Merlin rolled into the room, playing his violin. Everyonewas really surprised to see him. There was just one problem. Merlin had no wayto stop his roller skating. He rolled on, playing the violin. Then, with alleyes on him, Merlin hit into a huge mirror on the wall. The mirror broke intomany pieces with a very loud noise. But nobody forgot Merlin's wonderfulentrance after that.

It is known that there are different seasons in a year. But do you know the seasons in China? China is a large 1 and different parts have different features (特征). There are many 2 between the north and the south.

In 3 , it is quite cold in the north of China. The temperature is often 4 and the water freezes (结冰) in the river. Sometimes it snows 5 and everything is white after the snow. People often wear 6 coats and shoes to do outdoor activities, such as making 7 , throwing snow balls and going skating. But in most southern cities, the 8 is usually not that cold but much wetter in winter. People in Hainan can even go swimming in the sea and enjoy the bright sunshine on the beach.

People's way of 9 in the north is quite different from that in the south. In the north, people like eating food like buns and noodles, while rice is the main 10 for people in the south. People in the north usually come and go by land, but people in the south travel by land and by boat.

In general, if you decide to visit China, spring is the best time for the trip. Temperatures in most areas are warming up, but not yet so hot.

Whales are known as the largest animals in the ocean. It's a pity that they are in danger. The reason behind this is that some people kill them for their meat and oil. People want to protect these great animals. Every year, they go swimming along with whales in the ocean. People from various corners of the world come to watch. It's known as "The Great Whale Trail (GWT)". It raises money to protect the whales.

You can join in by helping us raise money. You have the chance to swim 10 kilometers in the sea with the large animal. The activity will take place on the 20th of July. The water can be cold, so it's important to wear a wetsuit (潜水衣). After the swim, there will be a party with music and food. You can bring your family and friends to join in the celebrations.

The activity only costs $50. This includes (含有) the swim, the party, and a T-shirt. Please help us to protect these great animals. We all love whales and understand their importance to our world.

Making your school a better place will make everyone around you happier and will get you more exited to go every day. Besides，a better place will also make you more productive（有效益的）. The following are some of the ways to make your school a better place. 

◆{#blank#}1{#/blank#}Do not stay silent when you see another student getting hurt by others. Speak up bravely and tell them to stop. This will help create a better atmosphere（气氛）at school. 

◆Try to deal with arguments between other kids. When you see other students in an argument，you can help deal with the problem. {#blank#}2{#/blank#}After all，many argument s in school are just misunderstandings between two people. 

◆{#blank#}3{#/blank#}If you know that other students have difficulty learning a subject that you're good at，you can help them by teaching them in that subject. Helping other students to improve their grades will help create a positive atmosphere in school. 

◆{#blank#}4{#/blank#}If you notice a student who doesn't have many friends or sits alone at lunch，make it a point to become their friend. {#blank#}5{#/blank#}So why not encourage other people to become friends with them？

The Big Stone River is one of the most amazing stone rivers in the world. 

The Big Stone River is the most interesting sight（景象）of Taganai Park in Russia. Different from other rivers, it is filled with rocks and stones. Not a drop of water can be seen. Interestingly, as one comes near to the rocky river, the sound of running water can be hear rocks fell down from the mountains slowly and made the river of rocks. 

The Big Stone River is about 6 km long and is made up of many small rocky rivers. It cuts through a thick forest like a real river. It is about 200 meters wide and in some places, it is up to 700 meters wide. Some of the rocks weigh up to 10 tons each and the layer（层）of rocks goes down 6 meters deep. 

Scientists believe it is the consequence of the movement of glaciers（冰川）about 10,000 years ago. At that time, ice covered the top of the mountains. As time went by, the ice turned into water. The Seeing the amazing river is a great experience. The best way to experience this natural wonder is from above. Come and visit it when you come to Russia.