【正文】 e a hot chocolate sauce called mole and pour it over chicken. The Mexicans also eat chocolate with spices like chili peppers.Chocolate is a product of the tropical cacao tree. Cacao beans taste so bitter that even monkeys say ugh! and run away. The word chocolate es from a Mayan word. The Mayas were an ancient people who once lived in Mexico. They valued the cacao tree. Some of the Mayas used cacao beans for money, while others ground them to make a bitter drink.When the Spaniards came to Mexico in the 16th century, they started drinking cacao, too. Because the drink was strong and bitter, they thought it was a medicine.When the Spaniards took the drink back to Europe, people discovered that sugar removed the bitter taste of cacao. Wealthy Spaniards heated the sweet drink and thought that it was good for their health.In the 19th century, an English pany made the first solid block of sweetened chocolate. Now people could both drink and eat chocolate. Later, a Swiss pany mixed milk and chocolate together. People liked the taste of milk chocolate even better.Besides the chocolate candy bar, one of the most popular American snacks is the chocolatechip cookie. Favorite desserts are chocolate cream pie and, of course, an ice cream sundae with hot fudge sauce.(280 words)14 The Blue RevolutionThe population of the world is increasing rapidly. By 2020, there could be people on earth. Will there be enough food for all these people, or will we have a food shortage? Some scientists think fish farming could solve this problem. However, other scientists worry that fish farming could cause serious environmental problems.Fish farming is not a new thing. There were fish farms in China 3,000 years ago. Today, about onethird of the fish we eat es from fish farms.Most fish farms raise planteating fish. Popular kinds of planteating fish are carp, tilapia, and catfish. Unfortunately, many fish farms are starting to raise meateating fish. A popular type of meateating fish is salmon. These meateating fish live on processed food made from wild fish. However, it takes up to 5 tons of wild fish to produce just 1 ton of farmraised salmon. The supply of wild fish is already decreasing. Eventually, many types of wild fish could bee extinct. What will we do then?Critics of fish farming also say that farmraised fish is unhealthy for humans. They say the fish contains dangerous chemicals. They also criticize fish farming because it pollutes the water. Another criticism is that farmraised fish can spread diseases to wild fish.Some people say that the farming methods being used now won39。t win just one gold medal. She won three. At the time, people called her the fastest woman in the world. As a young child, Wilma Rudolph could not participate in sports. She had a series of serious illnesses, and then, at the age of 4, she got polio. She lost the use of her left leg, and the doctors said she would never walk again.The people in Rudolph39。中學生百科英語2:Thoughts amp。s family did everything they could to help her walk again.Wilma and her mother frequently traveled 100 miles to get treatments for her leg. Her brothers and sisters took turns giving her leg a daily massage. Four times a day, they helped her do special exercises for her leg. Amazingly, by the time Rudolph was 9 years old, she was able to walk again. Before long, she started playing basketball and running. In high school, she was a track star, and then she went to the Olympics.Wilma Rudolph retired from her career as a runner when she was 22 years old.She then became a teacher and track coach. Her story encouraged many people to work hard and to overe difficulties.(244 words)11 The Puffer FishMost people avoid eating dangerous foods. They don39。t produce enough fish anyway. Instead of putting fish farms in lakes or near the coast, they say that the fish farms should be moved far out into the ocean. Several countries are already experimenting with deepocean farms. In the future, fish farms might be large cages that move across the ocean.Like most things, there is both a good and a bad side to fish farming. Fish farming may help to feed millions of people. At the same time, however, fish farming may damage the environment.(307 words)15 TwentyOne Days Without Food Why would someone decide to stop eating? We know that the body needs food in order to function well. However, many people fast at some time during their lives. Why is this?Some people fast for political reasons. In the early 20th century, women in England and the United States weren39。t something from outer space that destroyed the area. Instead, some scientists now think gas from the center of the earth caused the explosion.Scientists continue to travel to the Tunguska plateau looking for clues to the cause of the explosion. Every few years newspapers report that scientists finally have a solution to the Tunguska。s need for independence. For 21 days, he went without food. Another famous faster was Cesar Chavez. In the 1960s, he fasted for three weeks. Why? His goal was to bring attention to the terrible working conditions of farm workers in the United States.Fasting is also a spiritual practice in many religions. Every year during the month of Ramadan, which is a religious holiday, Muslims fast from sunrise to sunset. Many Hindus fast on special occasions, as do some Christians and Buddhists.Of course, not everyone fasts for political or religious reasons. Some people occasionally fast just because it makes them feel better. The American writer Mark Twain thought fasting was the best medicine for mon illnesses. Whenever he had a cold or a fever, he stopped eating pletely. He said that this always made his cold or fever go away. Another American writer, Upton Sinclair, discovered fasting after years of overeating, indigestion, and headaches. His first fast lasted for 12 days. During this time, his headaches and stomachaches went away. Sinclair said that fast