填空题

Some experts believe that, if not for the cultural changes that Africa has experienced, the AIDS virus would not have spread to its present extent.

【参考答案】

Y

<上一题目录下一题>

热门试题

填空题

The U.S. Food and Drug Administration has acted against similar contamination incidents like that involving SV40 out of fear of a wider spread of AIDS.

填空题

The AIDS epidemic is worse in American cities than in African cities.