结构推理 Directions: Read the following passage(s) carefully and give brief answers to the questions. Questions 1 to 5 are based on the following passage. AIDS is in the news almost every day. Some reports tell about the deadly (致命的) sickness. Others describe the efforts to develop cures. And others report the continuing increase in death caused by the spreading virus. Here we will discuss this international problem and the efforts to treat it. AIDS is a life-threatening sickness that attacks the body's natural defense methods against disease. It can destroy the body's ability to protect itself. AIDS itself does not kill. But because the body's defense method is damaged, the patient has little ability to fight off many other diseases – including cancer and blindness. The World Health Organization says as many as 10 million persons in the world may have the virus that causes AIDS. Officials believe about 350 thousand persons have the disease and one million more may get it in the next five years. In the United States, about 500,000 persons have died with AIDS. The country's top medical official says more than 90 percent of all Americans who had the AIDS virus five years ago are deaD、 There is no cure for AIDS. However, researchers know much more about AIDS than they did just a few years ago. We now know that AIDS is caused by a virus. The virus infects healthy cells(细胞), including white blood cells that are part of our defense method against disease. It takes control of the healthy cell’s genetic (基因的) material and forces the cell to make a copy of the virus. The cell then dies. The virus moves on to infect and kill more healthy cells. 1. What do the reports in everyday news mainly deal with? 2. AIDS is deadly because __________. 3. According to the officials, how many people may have AIDS in the next five years in the world? 4. How soon will most of the people who have AIDS probably die? 5. What happens to healthy cells when the virus HIV infects them?