You probably don't think about soil often, but the following report may help you learn about science of soil.

What is soil made of?

Soil is made of sediments (沉积物) and humus(腐殖质). Sediment is small pieces of rock broken down over time by rain, ice, and wind. Sediment is often found in water. Humus comes from decayed(腐烂的) plants and animals. It helps give plants a lot of the food they need to grow.

How does soil form?

Over centuries, rock breaks down into very small pieces.

The rock pieces mix with humus.

The humus gets thicker and thicker over time. Soil is formed(形成)l

How are soils different?

Soils can be different colors and have different textures(质感). Texture is how the surface of an object feels. Color and texture are two features(特征) of soil.

Plants and soil

Plants do not grow well in some soils. Sandy soi1 is too dry. It does not hold water. Soil with too much clay is too thick. Most plants grow well in dark, rich garden soil that has different sediments and a lot of humus in it.

   My mother was telling me about how she and her family got their first television when she was a teenager. Of course, it was black and white. She said she only watched it at night. When I was young, we had only about 3 or 4 different channels. My brothers, my sisters and I would sometimes fight about which channel to watch. But we usually enjoyed the same shows.

   Nowadays, we can get hundreds of channels on TV. There are channels with old movies, cooking, fishing and so on. It's amazing! I wonder how much my brothers, my sisters and I would fight if we had hundreds of channels when I was a child. Of course, we had only one television set. These days I notice families with 2 or 3 or more television sets in their homes. I guess it stops people from arguing over which channel to choose.

    In the Olympic history before no city has hosted both the Winter and Summer Olympics. Now,Beijing will be first the city doing it.

    After hosting the Summer Olympics in 2008 China will hold the 2022 Winter Olympics. On July 31st,2015，China beat Kazakh rival(对手) Almaty in a surprisingly close vote(选票).

    In 2008 Beijing shut down many factories to reduce pollution，and the cost of hosting the Summer Olympics was $44 billion. During the 2022 Winter Games, however, Beijing hopes to show a greener China，with only $3.1billion.

  Beijing plans to use several playgrounds from the 2008 Olympics, including the Bird's Nest and Water Cube. But the Wand sliding events would be in Yangqing and Zhangjiakou,60 and 140—kilometers away from Beijing.

    Beijing was seen by the IOC as a safe, reliable (可靠的) choice because it offered great commercial (商业的) opportunities in a new winter spors market.

    “It is really a safe choice," IOC President Thomas Bach said,"We know China will keep its promises."

    Some of you might often feel unhappy or forget how great you are. But do you want to make you feel good about yourself? {#blank#}1{#/blank#}

    Look at the mirror and say to yourself, I am a special person and there's no one in the world like me. I can do anything. It may not sound good, but it really works!

    Smile. {#blank#}2{#/blank#}Look for the good things in your friends and family.

    Do something nice for someone. Helping others always makes you feel good.

    {#blank#}3{#/blank#}Have you ever wanted to decorate(装饰) your own room or learn how to swim? Go for it! New challenges are fun and give you a sense of achievement when you have finished.

    {#blank#}4{#/blank#}Turn off the TV, be friends with the books and let your dream fly!Write down your thoughts, dreams or anything you want! Writing always helps to open up your thoughts.

    Stay with your family. We all need our family time. {#blank#}5{#/blank#}

    Do you have any difficulties while studying? In fact, to learn with success is not a very difficult task if you follow some basic rules. I hope they will help you study successfully.

    All problems can be solved by working hard. It makes the fool wise, the poor rich, the weak strong. It makes a wonderful difference. In learning, a hard—working fool gets more than a lazy wise.

    To set our heart on one thing at a time and give up all other thoughts is also a good way. Those who often change their subjects will never succeed. For this reason, while you are learning one subject, don't consider learning another one in order to be successful.

    Constancy (持之以恒) makes a certain (必然). On the other hand, inconstancy often results failure(失败).If we study day after day, than is nothing that can not be achieved. We should remember a worthy saying "'Constant dropping of water wears away a nonce"

    Besides, to be on time is another rule. It helps to achieve your dream. The habit of keeping certain hours is of very importance to successful learning. Work while you wok; play while you play. Every man will certainly become strong and wise as long as we does so.