[填空题] The World Health Organization (WHO) says as many as 10 (36) _______persons worldwide may have the virus (病毒) that (37) _______ AIDS. Experts believe about 350-thousand persons have the (38) _________. And one million more may get it in the next five years. In the US, about 50,000 persons have died with AIDS. The country’’s top (39) _______ official says more than 90 percent of all Americans who had the AIDS virus five years ago are dead. There is no (40) _________ for AIDS and no vaccine (疫苗) medicine 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 (41) ________ system against disease. It takes control of the healthy cell’’s genetic material and forces the cell to make a copy of the virus. The cell then dies. And the viral particles move on to (42) ________ and kill more healthy cells. The AIDS viru

[填空题] The World Health Organization (WHO) says as many as 10 (36) _______persons worldwide may have the virus (病毒) that (37) _______ AIDS. Experts believe about 350-thousand persons have the (38) _________. And one million more may get it in the next five years. In the US, about 50,000 persons have died with AIDS. The country’’s top (39) _______ official says more than 90 percent of all Americans who had the AIDS virus five years ago are dead. There is no (40) _________ for AIDS and no vaccine (疫苗) medicine 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 (41) ________ system against disease. It takes control of the healthy cell’’s genetic material and forces the cell to make a copy of the virus. The cell then dies. And the viral particles move on to (42) ________ and kill more healthy cells. The AIDS viru

[单项选择] The World Health Organization says as many as 10 million persons worldwide may have the virus (病毒) that causes AIDS. 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 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 and no vaccine (疫苗) medicine 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 cell’’s genetic (遗传的) 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 more healthy cells. The AIDS virus is carried in a person’’s body fl
A. An AIDS mother can pass on the virus to her unborn child.
B. The AIDS virus can be passed on through infected blood.
C. The AIDS virus can be passed on by shaking hands and sharing belongings.
D. The AIDS virus is passed sexually.