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  3. AIDS is one of the most fatal and rampant diseases that deprives of hundreds of thousands of lives each year all over the world,

AIDS is one of the most fatal and rampant diseases that deprives of hundreds of thousands of lives each year all over the world,

admin2009-04-27  103
问题     AIDS is one of the most fatal and rampant diseases that deprives of hundreds of thousands of lives each year all over the world, and the condition in African countries is much worse for lack of medicine, education as well as preventive measures. Scientists and researchers have never ceased their efforts to halt the wide spreading tendency of this infecting disease, unfortunately, till now, they have not invented any effective vaccine. Last week, an experimental AIDS vaccine tested in Thailand on some 2,500 drug users failed to protect them from becoming infected with HIV, declared VaxGen Inc., the vaccine’s developer. The pool results were widely expected since VaxGen Inc. had said earlier that its vaccine did not work in a larger North American study.
    Most AIDS researchers agree that vaccines will be the only effective way to control a virus that has killed 28 million people and infected 42 million more worldwide.
    Two dozen other vaccines are being tested on 12,000 human volunteers, but none has advanced as far as VaxGen’s, and any successful candidate is years away. Officials at Brisbane, Calif-based VaxGen said the Thai results underscored again how wily AIDS is in thwarting the immune system. The findings also show "how important it is for the international public health community to redouble the effort to develop an effective vaccine," President Dr. Donald Francis said.
    VaxGen’s vaccine, like most others being tested, did not contain the virus itself and cannot cause AIDS. Instead, the vaccine contained small, manmade genetic bits of the virus that scientists had hoped would provoke an immune response strong enough to stop the virus from invading healthy cells. Three years ago, the company enrolled 2,546 people in and around Bangkok who were at high risk for HIV because they habitually swapped needles to inject drugs. Half were given the experimental vaccine and half were given a placebo. All volunteers were given extensive risk-reduction counseling, the company said. In the end, the vaccine offered no greater protection: 105 people given the placebo became infected with HIV, while 106 people given the vaccine tested positive. In February, VaxGen announced its vaccine was ineffective against a different AIDS strain found in North America.
    The failure of this experimental vaccine reinforces the hardness of anti-AIDS battle, and the ultimate success seems to emerge years later. However, mankind is not so vulnerable to be completely defeated by AIDS.
选项 A、In Thailand
B、In North America
C、At Brisbane
D、In Africa
答案A
解析 细节分析。在第一段该句话中"Last week，an experimental AIDS vaccine tested in Thailand on some 2,500 drug users failed to protect them from becoming infected with HIV，declared VaxGen Inc，"我们可以得出答案是A。而关于B，一项更大的试验在那进行。而C项布里斯班 (澳大利亚城市)，总部在加州的VaxGen公司有分部设在那里，跟问题无关。D项只在说明一些非洲国家的情况就更糟时提及。
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