When we talk about the universe, we mean not only the earth, the sun and the moon, but also the stars and space between them. There are millions of stars in our sky. The sun is one of them. Around it there are eight big planets moving, including the earth. The moon is our nearest neighbor in space. If you look at the sky on a clear night, it is possible to see about 3, 000 stars. They look small, but they are really very big hot balls of burning（燃烧着的）gas. Some of them arc huge（巨大的）, but others are much smaller like our planet Earth. The biggest stars are very bright, but they can only live for a short time. Every day new stars are born and old stars die.

    All the stars are very far away. The light from the nearest star（except the sun）takes more than four years to reach the earth.

    Hundreds of years ago, people used stars, like the North Star, to know which direction（方向）to travel in.

Today you can still see that star.

    Many scientists think that the Earth is getting warmer and warmer. If the change continues, the natural world and human society will face danger. Scientists believe human activity is responsible for the climate change. We produce too many greenhouse gases. They keep heat in the air and make the Earth warm.

    Many of the world's governments agree. And they want to solve the problem. So from 7 to 18 December, 2009，they held a conference in Copenhagen, Denmark to talk about global warming and climate change.

    Representatives(代表) from 192 countries and regions went to the meeting. Although they have not reached an agreement, the Copenhagen Accord(《哥本哈根协议》) was an important beginning to save the Earth. It was made by a small group of countries including China，the USA，India, Brazil and South Africa. Some other countries at the conference also showed support.

    What are the key points of the Copenhagen Accord? The accord limits global temperature increases to 2C by 2050. Scientists think it could help the world to avoid serious climate change.

    The accord also says that developed countries must promise to cut greenhouse gas emissions(排放) to the UN by 31 January, 2010. The accord asks developed countries to give money to help developing countries.

    Many countries and organizations are disappointed that the conference didn't reach a legal document(法律文书). And they think the accord is not clear enough about its goals.

African leaders are worried that the goal of a 2℃ global temperature increase isn't good enough, because it will mean a much higher increase in temperature across Africa. This could cause big problems like food and water shortages across the continent.

    Still, UN Secretary General believes the conference was an "improvement".

    "Finally we reached a deal," Ban said," the accord may not be everything everyone had hoped for, but this is an important beginning."

Because of the COVID -19, many zoos are having hard time. Luckily, there are new ways for them\ to raise money, such as having animal shows online, selling cultural products (文化产品), making animal stars and adopting animals online (云认养) .

For Nanjing Hongshan Forest Zoo, online adoption is one of the ways to get help to getthrough hard times. People from all over the world can pay to adopt their favourite animals. The zoo will use the money to buy food for its animals and pay for their medical care. If someone adopts animal, they can get a certificate(证书) and learn about the animal's daily life online. They can go to the zoo for free, have the chance to feed the animal and clean its living space.

Animals like elephants, golden monkeys, koalas and tigers are all on the adoptioa list. Each animal has its own introduction. You can see its photo and know about its age and living baits(生活习惯).

Adopting animals online makes people think about how a zoo works. Modern zoos are no longer places for visitors to see animals but places to teach people how to protect animals.

Reading is a lifelong journey. Put yourself into a world of books and get lost in another world—but where do you start? {#blank#}1{#/blank#}

◆  Ask a librarian(图书管理员)

The best people to throw your questions at are librarians! {#blank#}2{#/blank#} If you tell a librarian what you've read before and what you liked or disliked about it, they will suggest some possible books for you to try. 

◆ Make a change. 

{#blank#}3{#/blank#}You may get used to reading history books or you just take an interest in science fictions. What about the books about culture? You'll never know until you try. Give a new style a chance and you may enter a whole new world of reading. 

◆ Read reviews. 

Book reviews can help you decide if a book is for you. There are usually short reviews on the covers of books. {#blank#}4{#/blank#}Some websites provide book suggestions from writers, parents and teachers. Some people's opinions about the books are very interesting. Their ideas may help you get a right pick. 

◆ {#blank#}5{#/blank#}

Reading something comfortable might be your first choice. But why not challenge yourself to read something more complicated(复杂的)? It is a good way of pushing yourself to improve your reading skills.