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    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.

In the Beijing Winter Olympics, we were treated to incredible displays of athletic talents as competitors took to the snow and ice. As a popular sport at the Winter Olympics, ski jumping is one of the best examples to showcase the "superhuman" power of athletes.

Ski jumpers soar into the air and appear to be almost flying in the sky. How do they achieve this? Physics can offer us an explanation of how they make it. It involves the use of the laws of aerodynamics (空气动力学) to fight against gravity and increase lift while reducing drag.

To understand how ski jumping works, we need to consider three elements: gravity, lift and drag. Gravity is the force that pulls us towards an object. Lift occurs when an object is moving through the air—as its surface comes into contact with air particles (微粒), the particles are pushed down and away from the object, allowing it to move up. At the same time, this interaction creates drag, and slows down an object's movement.

While there is nothing that the skiers can do about gravity, they can twist their bodies into positions that allow them to achieve greater lift and avoid as much drag as possible. According to the Smithsonian Magazine, "To do this, athletes try their best to make their skis and body nearly parallel to the ground and place their skis in a V-shape just outside the form of the body. This position increases the surface area that produces lift and puts them in the ideal angle that will also maximize (最大化) lift."

Because of how the sport works, athletes' equipment is strictly controlled according to weight and height in order to avoid any unfair advantages. This means suits must be tight in order to ensure athletes cannot use them as a way to gain more lift. For athletes, minor day-to-day water weight changes as little as 300 grams. It can mean that suits will not be tight enough according to their body mass indexes (体重指数).

A lot of people play sports, but very few people become sports professionals(专家). If sports aren't going to be your future, then why should you play them? Why should you train every day? Why should you work hard and feel sore(酸痛的) the next day? Wouldn't it be better to forget sports and only pay attention to your lessons? In fact, there are a lot of reasons to play sports.

First of all, sports are a great way to exercise. Exercising keeps you health y and strong. It also helps you stay in a good condition. When you exercise, your body makes endorphins(安多芬) which give you more energy and make you feel happier.

Also, sports teach young people how to communicate and work as a team. They teach young people to respect(尊重) their coaches, teammates and players from the other team. Many reports say that sports help young people stay out of trouble. If a young person plays sports, he or she may have fewer problems. This is because sports teach people about rules. They also teach people that if they work hard, they might succeed.

Another good way of sports is that they make people leave their houses. These days, a lot of people spend too much time watching television and playing video games. When you play sports, you go outside and exercise in the sun. You take in fresh air. All of these things are important.

All in all, maybe you' re not going to become a sports professional, but that doesn't matter, sports will help you become a better and happier person.

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 Animals are our friends. The Asian elephant is loved by people around the world. 

My school is not big but beautiful. {#blank#}1{#/blank#} There are many flowers in the garden. 

The flowers are colorful — there are all kinds of colors. In the middle of the garden, there is a pool. {#blank#}2{#/blank#} They look very happy and free. 

There are two classroom buildings around the garden. There are 18 classrooms in the classroom buildings. And there are also many other rooms, such as a music room, a computer room and a reading room. There are all kinds of books in the reading room, such as storybooks, cartoon books and magazines. {#blank#}3{#/blank#}

The sports field is beside the two classroom buildings. {#blank#}4{#/blank#} And we can have PE class there if the weather is OK. 

I like my school very much.