Have you ever stayed in a hotel? Most Chinese hotels often provide guests with things like disposable(一次性) toothbrushes, toothpaste, shampoo and slippers. Many guests like the idea because they don't have to bring their own. But, if you travel to Beijing, remember to bring your own things. Starting from June, some hotels in Beijing will no longer provide guests with these disposable things. They want to ask people to use less disposable things.

    Many disposable things are made of plastic. People throw them away after only using them once. It is a waste of natural resources(资源) and is very bad for the environment. Do you know, one Chinese makes as much as 400kg of waste a year! Most of that waste comes from disposable things. In Beijing, people throw away about 19, 000 tons of plastic bags and 1, 320 tons of plastic lunch bowls every year! Plastic can take between 100 and 400 years to break down. So the less plastic we throw out, the better. So, wherever you travel, bring your own things and use them again and again.

    Back at home and at school, you can also do something, you can also do something to make our world a better place. Try to do these things in your daily life: Use cloth shopping bags, not plastic ones. After using a plastic bag, wash it out and let it dry. Then you can use it over and over again. Do not use paper cups. At your school canteen(食堂), use your own bowl and chopsticks instead of disposable ones.

    To protect our environment and our home, it is very necessary and important for us to save natural resources(资源).

    Everybody needs water. Everything needs water. We use water to wash the bowls(碗), clothes and ourselves. We use water to plant trees, flowers and crops(庄稼). Where does all water come from? It comes from clouds.

    Some of rain goes into the ground. Many people get it under the ground. Some rain water goes into the hills. It runs into lakes and rivers. Many people get it there.

    People and dogs have been living together for hundreds of years. When did dogs and people become friends? Where did dogs come from?

    A group of scientists tried to answer these questions. They just finished a study about the history of dogs. In the study, they looked at the DNA of dogs all over the world and found that dogs, like humans, shared DNA with their family members. The scientists put together a big family tree for dogs. It went all the way back to the animal's beginning.

    In this way, scientists learned about the history of dogs. The first dogs lived in Asia. They were born about 33,000 years ago. At first, there were only about 6,400 of them. Their parents were wolves(狼).

    The new study answers many questions. It raises some too. For example, what caused wolves in Asia to become dogs all those years ago?

    One idea is that their DNA slowly changed and the wolves became dogs in the end. As time goes by, dogs became "man's best friends" Or it could happen the other way around. It was possible that some wolves started living with people before they became dogs. Living with people led to many changes to these wolves. It changed their DNA, so their offspring(后代) became dogs. In other words, it was possible that wolves were our friends before they became dogs.

    By studying DNA, scientists now have a much better understanding of the history of dogs. ________.

    How exactly dogs came to be our friends is still unclear.

    Sam Scott and his sister are both students. They1to school every day. Some students often take a bus to school. They sometimes play2after school. They do3homework before dinner. They watch TV4about an hour. They go to bed5 It's a good habit.

    September 10th is Teachers' Day in China. It is a special and great f{#blank#}1{#/blank#}. A lot of students celebrate this day with their t{#blank#}2{#/blank#}. Teachers work very hard all the time in a year. O{#blank#}3{#/blank#}this day they can have fun. Which teacher is your f{#blank#}4{#/blank#}one? What present can you get r{#blank#}5{#/blank#}for your dear teachers? Floweror any little p{#blank#}6{#/blank#}? Your teachers are h{#blank#}7{#/blank#}to get your beautiful presents. Let's say "Happy Teachers' Day to our dear teachers t{#blank#}8{#/blank#}.