We know the mosquito very well. Mosquitoes fly everywhere. They can be found almost all over the world, and there are more, than 2, 500 kinds of them.

No one likes the mosquito. But the mosquito may decide that she loves you. She? Yes, she. It's true that male mosquito doesn't bite and only the female mosquito bites because she needs blood to lay eggs. She is always looking for things or people she wants to bite. If she likes what she finds, she bites. But if she doesn't like your blood, she will turn to someone else for more delicious blood. Next time a mosquito bites you, just remember you are chosen. You're different from the others!

    If the mosquito likes you, she lands on your body without letting you know. She bites you so quickly and quietly that you may not feel anything different. After she bites, you will have an itch(痒) on your body because she puts something from her mouth together with your blood. By the time the itching begins, and she has flown away.

And then what happens? Well, after her delicious dinner, the mosquito feels tired. She just wants to find a place to have a good rest. There, on a leaf or a wall, she begins to lay eggs, hundreds of eggs.

    Have you ever dreamed about a trip to the space? Seeds (种子) of some vegetables and crops are a lot luckier than you, as they have travelled to space and back.

    China is among the three countries in the world that carry out agricultural research (农业研究) in space. The others are Russia and the US.

    Since 1987, China has sent about 1, 000 species of seeds into space.

    These include green peppers, tomatoes, cucumbers (黄瓜), carrots, lettuce and wheat. Even on China's first manned spacecraft Shenzhou—V, there were some seeds from Taiwan.

    "Conditions in outer space such as radiation (辐射) and low gravity can cause big changes in the seeds," said Chinese researcher Jin Xing.

    But not all seeds are better after going to space. After returning to the Earth, the best seeds are selected. These seeds produce (生产) much more and also grow faster than normal (正常的) seeds

Laughter is natural for people. We start to laugh at about four months of age, We start to laugh even before we start to speak. 

Laughter connects us with others. We laugh more when we are with other people, It's difficult to pretend to laugh. Laughter is honest. {#blank#}1{#/blank#} When do people laugh? 

Only 10 to 20 percent of laughter is about something funny. Most laughter is about being friendly with other people. Most laughter says, "I don't want to compete with you. I want to be friendly with you." This kind of laughter brings people together. 

{#blank#}2{#/blank#} In movies, there is often a joke at an exciting moment when everyone feels nervous. It is usually a small joke, but we laugh a lot. Our laughter helps us relax. 

{#blank#}3{#/blank#} Not everyone has the same sense of humour. Some people think a joke is funny, but other people don't think so. {#blank#}4{#/blank#}

Our idea of what is funny changes with time, For young children, the world is new, They are interested in many things, so they laugh a lot. Teenagers often laugh to protect themselves. {#blank#}5{#/blank#} They laugh at things that give them stress, too. Our reasons for laughter change gradually.

Mesa Verde National Park, in Colorado, America, has many "cliff dwellings"— places that are built into the cliffs（悬崖）where people once lived. They look almost impossible to get to. Who lived in them, and why did they live there?

People lived there about 800 years ago. Americans call them the Ancestral Puebloans（古普韦布洛人的祖先）. They grew food on the mesa （平顶山）, the flat land on top of the cliffs. They kept animals on the mesa too. They travelled over the mesa to trade with each other. Why didn't they build homes on the mesa?

One reason was the weather. Winters were getting colder and colder. The mesa was flat and open. There was no protection from the cold winds. Most of the cliff dwellings face south or south-west from the cold north wind. Another reason people did not live on the mesa is that there were more and more people to feed. Homes on the mesa would use land that was needed to grow food. Some people say a third reason was for safety. They say different groups of Ancestral Puebloans were fighting each other. The cliff dwellings were hard to get into. so they kept the people who lived there safe. Other people don't believe it. They say the groups tract ed too much to have seen fighting. Everyone agrees that these people were the skillful builders, who used every bit of space in the cliffs to make their homes.

The eight- day holiday started on Friday. It was Mid- Autumn Festival( 中秋节) on Friday. However, many people chose to travel during the holiday. They were busy booking(预定) hotel rooms because the rooms were sold out(卖光) fast and expensive. At the same time," Living in my home during the National Day holiday" got popular online.

A 25- year- old man in Xiamen rented(租) out his apartment to two women traveling to the city from Xi' an, Shanxi Province. They rented the apartment at 200 yuan a night and they would stay for seven nights, while a hotel room could be more than 500 yuan a night." It was the first time I rented out my apartment during a holiday. There are no expensive and important things in my apartment. I want to rent it out to someone who will keep it clean," he said. After checking the guests' personal information, he decided to rent out his apartment and the women paid him 200 yuan as a deposit(押金).

What's more, a 35- year- old woman from Changsha advertised(做广告) two spare rooms in her apartment only for women guests, as she only used the main bedroom. She asked 188 yuan for the two rooms a day, and the rooms could be booked for all the available days.