单选题 {{B}}Text 3{{/B}}

As West Nile virus creeps toward California, an unlikely warrior could provide the first line of defense: the chicken. The familiar fowl make irresistible targets for mosquitoes. Unlike crows, chickens don't get sick from West Nile. But they do produce telltale antibodies to the virus. So in test coops scattered across the state, more than 2000" sentinel chickens" submit to frequent blood tests. When antibodies do turn up, California health officials will know that the inevitable has occurred: the West Nile epidemic will have swept the country.
Last week alone, more than 100 new human cases of West Nile were reported. The virus was detected as far west as Colorado and Wyoming, infecting 371 and killing 16 people in 20 states plus the District of Columbia. This year West Nile appeared earlier' in the mosquito season--mid-June instead of August--and claimed younger victims; the average age dropped from 65 to 54. Federal health officials are still trying to figure out why, but say they may be finding more West Nile precisely because they're on the lookout for it. As Dr. Julie Gerberding, the new director of the Centers for Disease Control (CDC), recently told reporters, We re not in crisis mode.
When West Nile hit New York City in 1999,the CDC realized it was a "victim of its own success. Because health officials had conquered most mosquito-borne diseases decades ago, many states abolished their mosquito-control programs. The Feds rushed in with funds -- some $ 50 million since 1999, plus $ 31 million more this year alone -- to train insect researchers, set up state testing labs and kill off the annoying insects. The CDC established a new computer monitoring system and held strategy sessions with state officials.
Some epidemiologists question the focus -- and the millions -- lavished on a virus that's killed fewer than 20. "There's an epidemic in gun violence that's taking more lives than West Nile virus," says Dr. William Steinmann, director of the Tulance Center for Clinical Effectiveness and Prevention. But the Feds say their efforts have kept West Nile from doing far more damage. "We're basically building the infrastructure to deal with this over the next 50 years, "says Dr. Lyle Peterson, a CDC epidemiologist. "This is here to stay. "
So far, there are no remedies for West Nile. Officials eventually expect the virus to settle into a quiet pattern of mild infections with occasional outbreaks. To do battle at home, the CDC recommends eliminating standing water and using insect spray with DEET -- simple precautions, but the best defense against an invader that shows no signs of going away.

单选题 In California scientists use chicken to

【正确答案】 D

【答案解析】[精析] 该题为细节题。根据第一段第三句至第五句“Unlike crows, chickens don't get sick from West Nile. But they do produce telltale antibodies to the virus. So in test coops scattered across the state, more than 2000 'sentinel chickens' submit to frequent blood tests.”我们知道，和乌鸦不一样，鸡不会染上西尼罗河病毒，但是鸡会产生一种抗体，这种抗体能够让人们详细了解西尼罗河病毒，因此，全州有2000多只“哨兵鸡”在接受频繁的血液检查。冈此，我们可以判断出，加利福尼亚州的科学家对鸡进行血液检查是为了检查鸡有没有产生西尼罗河病毒抗体，即检测西尼罗河病毒存在与否，故选择D项。

单选题 According to Federal health officials, the fact that more West Nile cases have been reported indicates that

【正确答案】 C

【答案解析】[精析] 该题为细节题。第二段第四句“Federal health officials are still trying to figure out why, but say they may be finding more West Nile precisely because they're on the lookout for it.”中的“be on the lookout for something”意为“注意，留心，警戒”，由此我们知道，联邦公共卫生官员仍然在寻找病毒蔓延的原因，但是认为因为他们对病毒的警惕性高，因此才可能会发现更多的感染者。故只有C项的表述正确。

单选题 CDC considered the outbreak of West Nile in 1999 as a consequence of

【正确答案】 A

【答案解析】[精析] 该题为细节题。根据第三段第一句和第二句“When West Nile hit New York City in 1999, the CDC realized it was a victim of its own success. Because health officials had conquered most mosquito-borne diseases decades ago, many states abolished their mosquito-control programs.”我们知道，1999年西尼罗河病毒在纽约大规模传播，疾病控制中心的官员意识到，纽约成为其成功的牺牲品，因为几十年前，公共卫生官员已经攻克了以蚊子为传染源的疫病，所以很多州废除了蚊子控制项目，故选择A项。

单选题 Feds claimed that their spending on West Nile control was

【正确答案】 A

【答案解析】[精析] 该题为推理题。根据第四段第三句和第四句“But the Feds say their efforts have kept West Nile from doing far more damage. 'We're basically building the infrastructure to deal with this over the next 50 years, ' says Dr. Lyle Peterson, a CDC epidemiologist. "我们知道，联邦调查局认为他们所做出的努力防止了西尼罗河病毒造成更大的损失，而且他们正在建设基础设施为未来50年的病毒预防做出准备，因此，我们可以推断出，联邦政府认为他们为预防病毒蔓延所作出的努力在长远来说是值得的，故A项正确；文中没有提到联邦调查局可能会继续为控制西尼罗河病毒投入资金以及将会彻底解决西尼罗河病毒蔓延事件，故不选择B、C项；D项是流行病学家而非联邦调查局的观点，故不选。

单选题 Which of the following would CDC most probably recommend?

【正确答案】 B

【答案解析】[精析] 该题为推理题。根据最后一段第三句“To do battle at home, the CDC recommends eliminating standing water and using insect spray with DEET--simple precautions, but the best defense against an invader that shows no signs of going away.”我们知道，为了消灭家里的病毒，疾病控制中心的官员建议消除死水及使用驱蚊露喷雾杀虫剂，这只是一些简单的预防措施，但却是对付西尼罗河病毒的最好的方式，故选择B项。