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 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) 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(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 person's 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.
Many stories about the spread of AIDS are false. You cannot get AIDS by working or attending school with someone who has the disease. You can not get it by touching drinking glasses or other objects used by such persons. Experts say no one has gotten AIDS by living with, caring for or touching an AIDS patient.
16 According to the WHO, there are now 10 million AIDS patients in the world.
A Right B Wrong C Not mentioned
17 America has the largest number of AIDS patients in the world.
A Right B Wrong C Not mentioned
18 The cause of AIDS remains a mystery to researchers.
A Right B Wrong C Not mentioned
19 AIDS patients today cannot be cured yet.
A Right B Wrong C Not mentioned
20 A pregnant woman with AIDS cannot pass the virus to her developing baby.
A Right B Wrong C Not mentioned
21 It is unlikely that the Aids virus will be passed through handshaking.
A Right B Wrong C Not mentioned
22 Men are more easily infected with AIDS than women.
A Right B Wrong C Not mentioned
参考答案：16. B 17. C 18. B 19. A 20. B
21. A 22. C
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