根据短文理解，选择正确答案。

    Pollution inside homes and other buildings kills more than 4 million people each year. Many people die as a result of breathing smoke or from cooking over wood-powered or coal-powered stoves.

    One way to reduce the number of deaths is through cooking equipment powered by the sun. Crosby Menzies, a solar power expert in a South African company, described his latest solar cooker called the "Sol-4". "It is four square meters of mirrors, six to eight meters in length. It is quite a large cooker. "

    The "Sol-4" works by reflecting (反射) light from the sun off large mirrors. The mirrors direct (把……对准) the light at a cooking pan. Then the light heats the pan with solar energy. Within two minutes, the pan is hot enough to cook sausages and onions. In just four minutes, water can be boiled. That is as fast as cooking with natural gas or electricity.

    The cooker is also much "friendlier" than other models because people do not have to stand in the sun to use it. And people can prepare meals without having to collect firewood or spend money on coal. Such individuals would be less likely to have breathing illnesses from harmful smoke.

    At present, the cooker only works when the sun is shining. But engineers are working on a way to make it work without sunlight.

    Each cooker costs about $ 2,000, which is a large amount of money for most Africans. To solve that problem, Crosby Menzies has created a non-governmental organization called Solar Cookers for Africa.  It plans to raise money through donations to provide poor people with solar cooking equipment.

    Some people wonder why countries spend millions of dollars on space projects. They want to know how space research helps people on Earth. Actually, space technology helps people on Earth every day. This is called "spinoff technology". Spinoff technology is space technology that is now used on Earth.

    In early space programs, such as the Apollo missions(任务) of the 1960s and 1970s, and in the space shuttle missions today, scientists developed objects for the astronauts to use on the moon and in space. We now use some of these objects every day. For example, we have Quartz clocks and watches with an accuracy of one minute a year. We purify the water we drink with a water filter(过滤器) designed for the astronauts' use in space. The cordless, hand-held tools we use in our homes, such as cleaners, flashlights, drills, and irons came from the technology of these early space programs.

    On cold winter days, we can stay warm with battery - operated shoes and socks, and insulated(绝缘的) coats and jackets. All of these clothes are similar to the spacesuit designs that keep astronauts comfortable in the temperatures of the moon, and are spinoffs from space technology.

    These products are only a few examples of the many ways space technology helps us in our everyday life. No one knows how new spinoff technology from the International Space Station will help us in the future.

Each country has its own "art of living". For example, the word "niksen" shows how Dutch people fight stress and tiredness in a fast-paced lifestyle.

The term "niksen" comes from the Dutch word "niks", which refers to"nothing". In practice, "niksen"could be as simple as just relaxing, looking at your surroundings or listening to music- as long as it's without purpose and not done in order to achieve something. Think "simply sitting in a chair or looking out of the window,"says Ruut Veenhoven, a professor at Erasmus University who studies happiness.

"Niksen" sounds contrary to the advice that we were all given as kids. Nowadays, we're always told to stay bus y and work harder than everyone else. But "niksen" is against that attitude. It offers the chance to "deliciously do nothing", as Carolien Hamming told Time. She thinks that "niksen" is very important to staying healthy, since it's a form of men tal relaxation and healing. Just like a wild animal lying in wait for their food,"niksen" seems to be a natural state of being.

For some people,"niksen" can mean more than just men tal relaxation. It's also a way to imagine new ideas or plans. As an early adopter of "niksen", Jenny Holden, adds it to her daily lunch breaks."Within 10minutes of doing nothing-just staring and listening to myself-my head began to clear and pick out my work and home to-do lists", she told the Metro UK. However, for many, doing nothing isn't as simple as it sounds.In fact, it can be somewhat challenging to sit still and stare out a window.

Above all, "niksen" is a suggestion for balancing work and rest. As Dutch-bom writer Ogla Mecking wrote in Whoolly Magazine,"niksen" is the full enjoyment of life's breaks".

Everyone is encouraged to have your "niksen" moments. They give you the strength to face everyday challenges.

Here comes autumn!It is the third season of the year. In China, autumn starts in September.  It is still a little warm, but it gets colder and colder. The days also get shorter and shorter. The leaves on the trees begin to turn yellow and red. The air is fresh. It's a great season for kids to play outside. What do children do in autumn in different countries?

In China, students often have an autumn picnic. Usually, they go out into nature. For  example, kids in Shenzhen like to go to the Donghu Park to play games with their classmates, like skipping(跳绳)and playing football. 

Japanese students often go hiking with their parents or classmates when the leaves are red and yellow. It is a perfect way to get exercise. Mountain climbing in nice weather is also a good choice. 

For most children in the US, biking is a good autumn activity. Take a mountain bike ride and you can find new roads. Playing in leaf piles(堆)is popular(流行的), too. Kids jump onto a leaf pile. They are happy to see the colourful leaves fly all around. They also make leaf rain. It's a lot of fun. 

In the UK, kids love to camp outside with their parents. They make food over the fire and tell ghost(鬼怪)stories. 

The People's Republic of China was founded on 1st October 1949. Later, from 1st October to 3rd October every year, Chinese people have some days o{#blank#}1{#/blank#}. This year, Lingling and her parents are going to spend the holiday in Shandong Province. They will visit some friends there and will stay there2 u{#blank#}2{#/blank#} the end of the holiday. 

The national day in the US is called Independence Day. It was first celebrated on the fourth of July in 1777. And the American people have celebrated it s {#blank#}3{#/blank#} then. 

The UK doesn't have a national day. People there just celebrate Christmas with a two- day holiday. It's the start of the vacation s{#blank#}4{#/blank#}. 

When the holiday begins, kids always go somewhere interesting and they always have lots of f{#blank#}5{#/blank#}. Family members always try to get together to have a good time.