【正文】 s largest nature reserve and it is kept in its natural state for the people of China and visitors from all over the world to enjoy. The height of the land varies from 700 metres above sea level to over 2,000 metres and is home to a great diversity of rare plants and animals. Among the rare animals are cranes, black bears, leopards and tigers. Many people e to Changbaishan to study its unique plants and animals. Others e to walk in the mountains, to see the spectacular waterfalls or to bathe in the hot water pools. However, the attraction that arouses the greatest appreciation in the reserve is Tianchi or the Lake of Heaven. Tianchi is a deep lake that has formed in the crater of a dead volcano on top of the mountain. The lake is 2,194 metres above sea level, and more than 200 metres deep. In winter the surface freezes over. It takes about an hour to climb from the end of the road to the top of the mountain. When you arrive you are rewarded not only with the sight of its clear waters, but also by the view of the other sixteen mountain peaks that surround Tianchi. There are many stories told about Tianchi. The most wellknown concerns three young women from heaven. They were bathing in Tainchi when a bird flew above them and dropped a small fruit onto the dress of the youngest girl. When she picked up the fruit to smell it, it flew into her swallowed the fruit, the girl became pregnant and later gave birth to a handsome boy. It is said that this boy, who had a great gift for languages and persuasion, is the father of the Manchu people. If you are lucky enough to visit the Lake of Heaven with your loved one, don39。 it will encourage a greater range of animals all of which will make life for human beings better. Greenhouse gases continue to build up in the atmosphere. Even if we start reducing the amount of carbon dioxide and other greenhouse gases, the climate is going to keep on warming for decades or centuries. No one knows the effects of global warming. Does that mean we should do nothing? Or, are the risks too great?WHAT CAN WE DO ABOUT GLOBAL WARMING?Dear Earth Care,I am doing a project on behalf of my school about global warming. Sometimes I feel that individuals can have little effect on such huge environmental problems. However, 1 still think people should advocate improvements in the way we use energy today. As I39。greenhouse effect39。 that is, the part of the body that fights disease. You can have HIV in your blood for a long time, but eventually HIV will damage your immune system so much that you body can no longer fight disease. This stage of the illness is called AIDS. If you develop AIDS, your chances of survival are very small. HIV is spread through blood or the fluid that the body makes during sex. For a person to bee infected, blood or sexual fluid that carries the virus, has to get inside the body through broken skin or by injection. One day scientists will find a cure for HIV/AIDS.Until that happens, you need to protect yourself. Here are some things you can do to make sure you stay safe.If you inject drugs:do not share your needle with anyone else. Blood from another person can stay on or in the needle. If a person has HIV and you use the same needle, you could inject the virus into your own blood.do not share anything else that a person has used while injecting could have spilt on it.If you have sex with a male or a female:use a condom. This will prevent sexual fluid passing from one person to another. The following statements are NOT true.A person cannot get HIV the first time they have . If one sexual partner has HIV, the other partner could bee infected.You can tell by looking at someone whether or not they have . Many people carrying HIV look perfectly healthy. It is only when the disease has progressed to AIDS that a person begins to look sick.Only homosexuals get . Anyone who has sex with a person infected with H1V/AIDS risks getting the virus. Women are slightly more likely to bee infected than men.If you hug, touch or kiss someone with AIDS or visit them in their home, you will get HIV/ can only get the disease from blood or sexual , people with HIV sometimes lose their friends because of people are afraid that they will get HIV/AIDS from those infected with HIV!AIDS. For the same reason, some AIDS patients cannot find anyone to look after them when they are sick. You can get HIV/AIDS from . There is no evidence of this.選修6 Unit 4 Global warmingReadingTHE EARTH IS BECOMING WARMERBUT DOES IT MATTER? During the 20th century the temperature of the earth rose about one degree Fahrenheit. That probably does not seem much to you or me, but it is a rapid increase when pared to other natural changes. So how has this e about and does it matter? Earth Care’s Sophie Armstrong explores these questions. There is no doubt that the earth is being warmer (see Graph 1) and that it is human activitythat has caused this global warming rather than a random but natural phenomenon. All scientists subscribe to the view that the increase in the earth39。t know their babies may have a smaller birth weight or even be abnormal in some way. Neither did I know that my cigarette smoke could affect the health of nonsmokers. However, what I did know was that my girlfriend thought I smelt terrible. She said my breath and clothes smelt, and that the ends of my fingers were turn