Lake Victoria is the largest lake in Africa. It is also the second largest lake in the world. It is an important lake because it is one of the sources(源头) for the longest river in the world, the Nile River. Lake Victoria provides a source of water, food, and power(电力) for several African countries. Lake Victoria is a big part of African life.
   Unfortunately, Lake Victoria has a problem. It is shrinking. There are several power stations at Lake Victoria in Uganda. These are on the Nile River, and besides producing power, they keep the water of the lake at a certain level. For the past forty years, that level has been 11.9 meters. Over the last several years, the water level has dropped by about 2.5 meters. There seem to be several reasons for this drop.
   One possible reason is drought(干旱). Drought has been very bad in the area since 2000. Lake Victoria gets all of its water from rain, so the drought means less water in the lake.
   However, some environmentalists believe that the real problem is the power plants(工厂) on Lake Victoria. Uganda depends on those power plants for most of its power, and they made the power plants larger in 2000. Many people believe the power plants have been taking too much water off Lake Victoria. As a result, they have been asked to use less water until Lake Victoria goes back to its old level.
   Whether the low water level is caused by drought or power plants, the result is the same. This is already a poor area of Africa, where many people live a really hard life. People, animals and plants around Lake Victoria will suffer even more from low water levels on the lake. Many people need Lake Victoria for fishing or growing food. Fish need the water to live, and animals need it for water. Plants around the lake will die without the water, and then more animals and people will suffer. Unless the lake fills soon, many people will suffer and die.

    One day, an American man Simon went to London to visit his friend, Rick. Rick told him that his flat(公寓) was on the first floor. When he arrived, Simon went straight to the first floor of the building. But a man told him that there was no Rick on that floor. Do you know why?

    In fact, the British (英国人) call the first floor of a building the ground floor. The floor above the ground floor is the first floor, but Americans would call it the second floor.

    The story shows that there are a few culture differences between Britain and America, though the British and Americans both speak English.

    The British don't like showing their feelings. They hardly start a small talk with strangers. For example, on the train the British often spend their time reading newspapers or books. But Americans are quite different. They're more active and easier to talk with.

    The British and Americans may use different terms for the same things. The British usually use "football" "holiday" and "lift", but Americans like to use "soccer" "vacation" and "elevator".

    What did you do on April 23 , World Book Day ? Did you find any interesting books ? Here is a book list from China's GAPP（中国新闻出版总署）.

    Do you know what couch-potato means? Well, in America, the word is now often used. The American couch-potato becomes maybe even a part of American tradition. You see, in America, many people often spend their free time sitting on a couch（沙发）watching TV. As there are many programs to choose, the TV can be quite interesting and very addictive（上瘾的）. One may sit and watch TV for hour and hour without stop. They do nothing else but watch TV. These people are called couch-potatoes.

    In America, when one watches TV, he is most often sitting on a couch. While watching TV, most of these people look so frozen that they almost look dead. Everyone is sitting still（安静地） with eyes looking right into the same black box. Also because these people are addictive to TV, they don't exercise and usually get very fat. So in many ways, they look like real potatoes. Well, because they look so still and fat, and watch TV on a couch, they are all called couch-potatoes.

    Now you know what couch-potatoes means. The next time if you see someone watching TV too long, just say, "What a couch-potato!"