Don’t throw away your old phones.You are actually throwing away real gold! Smartphones have many kinds of useful metals. People can recycle them to make new electronics.

But many people may not know this. In Australia alone there are more than 25 million unused mobile phones lying around, The Sydney Morning Herald reported. The gold in these phones can add up to a value of more than $80 million. There are about 2 billion smartphone users around the world, who change their phone once every 11 months on average. So in China, eighty million old phones come along every year.

However, it’s not easy to get the useful things out of the phones. Smartphones have not only useful things but also harmful materials. Guiyu, a small town in Shantou, Guangdong, is one of the world’s biggest dumping grounds for electronic waste, Reuters reported. Many recycling centers in Guiyu simply break the old electronics by hand and don’t think about the pollution it causes. It’s reported that 81 percent of children in Guiyu are harmed by lead poisoning(铅中毒).

Veena Sahajwalla, a professor at Australia’s University of New South Wales, has made a mini factory. It makes smartphone recycling cleaner and easier. The mini factory is very small and easy to move around. It breaks the phones and automatically(自动地)removes the phone’s useful things. That way, humans do not get poisoned.

Well, have you ever wondered what happens to the old phone after it’s no longer yours? A part of your old smartphone could soon be proudly worn around the neck of one of the world’s top athletes. Organizers of the 2020 Tokyo Olympics say that medals for the event will be made from recycled phones. They will also be made out of people’s thoughts for avoiding waste. They think there is an important message in this for the future.

Ethiopia (埃塞俄比亚) broke the world record for the most trees planted in one day, making the world a little greener. 【小题1】 This broke the record held by India by 50 million trees. Ethiopia’s government (政府) announced the record-breaking success online. 【小题2】 Ethiopia’s officials also took part in the tree planting. The government congratulated everyone who had put great efforts.

【小题3】 The country is on its way to make it. So far, volunteers, businessmen and government workers have planted over 2.6 billion (十亿) trees. Ethiopia is trying to prevent its forests from declining (减少). 【小题4】

This is a sharp decline from 30% at the end of the 19th century. Planting billions of trees is the cheapest and most effective way to take in CO₂. 【小题5】

Some people think riding bicycles isn’t popular. They aren’t interested in it. So less and less people ride bicycles in the city. Nowadays some office workers usually go to work by car. Most students take the bus or the subway to go to school.

But I don’t think so. I think riding bicycles is good for my health. It has many benefits（益处）. Firstly, when I am riding a bicycle, my whole body is exercising all the time. It is a good way to keep fit. Usually most office workers are busy with their things and most students are busy with their lessons, so they have no time to do sports. So riding bicycles is a good way to keep healthy for them.

Secondly, riding bicycles does good to our environment（环境）. As we know, driving cars can pollute（污染）air. It makes the temperature high day by day. If we go to work by bike, the air will become cleaner than before. We can also save money at the same time. Why not enjoy doing it?

Riding bicycles is good for our health and the environment. We should all ride bicycles.