A、Promising drugs will soon stop AIDS. B、The spread of AIDS could be controlled. C、It is hopeless to win the battle against AIDS

Karen, grown up in a very traditional family in the western United States, maintained high moral standards throughout her youth. In 1984, at the age of 23, she married Bill. They were blessed with two children, a boy and a girl.
    By 1991 their love had deepened, and they were happy. Later that year, Bill developed a white spot on his tongue. He visited a doctor.
    One day shortly after that, Bill called Karen to sit beside him. He said with tears in his eyes that he loved her and wanted to live forever with her. The doctor suspected that he had been infected with HIV, the virus that leads to AIDS.
    The family was tested. Bill and Karen’s results were positive. Bill had become infected before he met Karen: then he passed the virus on to Karen. The children’s results were negative. Within three years, Bill was dead. "I don’t know how to express what it is like to watch the once handsome man you love and intend to live with forever dying slowly. I cried many nights. He died three months short of ten years of our marriage," says Karen. Though a doctor told Karen that she would soon follow her husband into death, she is still alive. The infection has progressed to the early stages of AIDS.
    Since the beginning of the spread of AIDS in 1981, about 11.7 million people have died of it. It is roughly calculated that in 1997 alone, about 2.3 million people died of it. Nevertheless, there are fresh reasons for optimism in the battle against AIDS. During the past few years, there has been a drop in new AIDS cases in wealthy nations. In addition, promising drugs hold out hope of better health and longer life.
Questions 23 to 25 are based on the passage you have just heard.
23. What does the speaker intend to do by telling the story of Karen?
24. When was Bill suspected of being infected with HIV?
25. What can be concluded from the passage?