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第2部分：阅读判断(第1～7题，每题1分，共7分) 下面的短文后列出了7个句子，请根据短文的内容对每个句子做出判断：如果该句提供的是正确信息，请选择A;如果该句提供的是错误信息，请选择B;如果该句的信息文中没有提及，请选择C。 AIDS The World Health Organization (WHO) says as many as 10 million persons worldwide may have the virus that causes AIDS(艾滋病)。 Experts 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 50，000 persons have died with AIDS. The countrys 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 and no vaccine(疫苗) to prevent it. 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 invades healthy cells， including white blood cells that are part of our defense system against disease. It takes control of the healthy cells genetic(基因的) material and forces the cell to make a copy of the virus. The cell then dies. And the viral particles move on to invade and kill healthier cells. The AIDS virus is carried in a persons body fluids(液体)。 The virus can be passed sexually or by sharing instruments used to take intravenous(进入静脉的) drugs. It also can be passed in blood products or from a pregnant woman with AIDS to her developing baby. | 
