Jack's friend Sally isn't fine these days.

    One day she asks Jack for help. And she tells (告诉) Jack about her eating habits. For breakfast, she always eats some bread. For lunch, she always has some chicken. She likes eating ice-cream and a hamburger in the evening.

 “They're not healthy for you, Sally,” Jack says.

 “I know, but I like them,” Sally says.

 “What about vegetables? Do you like eating carrots?” Jack asks.

 “No, I don't,” Sally says.

 “Sally, don't eat ice-cream. You must eat some vegetables and fruit. They are good for you.” Jack says.

 “I think you're right,” Sally says.

    In the next days, Sally always eats vegetables and fruit. And she is well now.

    The great pyramids of Egypt were built more than 4000 years ago as tombs for the pharaohs, or kings, of the time．

    When the core of the pyramid was finished, the outside was covered in a white stone called limestone．

    The peak of the pyramid was capped in gold．

    At the same time, laborers, masons and artists finished off the work inside．

    Each chamber was lined with fine stone．

    The walls were painted with scenes from the pharaoh's life, or the building of the pyramid．

    When the inside and the outside of the pyramid were finished, beautiful art works and goods for the pharaoh's next life were put in the chambers．

    Then, the mummy was placed in its special chamber．

    Finally, the passages to the chambers were filled with huge stones, and the openings were closed off and covered in limestone．

    Eleven countries are building a great wall of trees across Africa. It is called the Great Green Wall. The aim is to bring life to the dry lands and help to fight the bad environment.

    The wall is 8, 000 kilometers long and 15 kilometers wide. It covers from Senegal in the west to Djibouti in the east, on the south of the Sahara Desert (撒哈拉沙漠). So far, Senegal has made the best progress by planting about 11,000,000 trees.

    Many years ago, there were few trees in that area and the winds used to be very strong. It was harmful to the fields. Also, there was little rain, so few plants could grow and many people went hungry. Since the tree planting project started, the trees have provided food for the local people and increased the wetness (湿度) of the air. Little by little, there appeared green fields for people to grow plant.

    The project which began in 2007 is supposed to cost a total of 8, 000, 000, 000 dollars. Many countries are trying their best to help to continue the planting. So we will be able to see the whole green wall across Africa in the near future!

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A. Wear right clothing. At least, you have to wear a safety helmet.

B. Avoid speeding Use a "Speed Limiter" to control the speed.

C. Keep a safe distance between you and other riders when using the Segway.

D. Keep a firm hold on the Segway at all times. Always have both hands holding the handlebar.

E. Learn how to operate the Segway before using it. Read the user manual carefully.