单选题
Thailand confirmed three new human bird flu cases Thursday as health officials warned it could take two years to conquer Asia's outbreak. Meanwhile, the World Health Organization said the latest tests show no sign of a killer hybrid virus that could easily pass between people.
Tests on a cluster of bird flu cases in a Vietnamese family showed there was no mixing of genes between the bird flu strain and human flu, according to WHO.
In the United States, a strain of bird flu was found at four live chicken markets in northern New Jersey, just days after outbreaks at two farms in Delaware led to the destruction of thousands of birds.
WHO has said the best way to control the spread of the disease is by culling the birds. In Asia, tens of millions of chickens have been killed by infections or slaughtered in containment efforts as bird flu spread, jumping to people in Vietnam and Thai-land.
The human death toll stood at 19 on Thursday.
While two of the three people labeled as new cases in Thailand have recovered, the third, a 13-year-old boy, was in intensive care in northeastern Chaiyaphum province, Thai officials said.
Fears of an outbreak prompted Singapore, believed free of bird flu, to announce plans to euthanize 5,000 healthy chickens in a drill to prepare for any possible infection.
Ten governments in the region have dealt with the disease over the past couple of months, with China boosting its culling efforts as reports of infections there increased.
Beijing said Thursday it was mobilizing 16,000 workers for anti-bird flu efforts in a province bordering Vietnam where China's first bird flu case of the season was confirmed in late January. Among their tasks is to try to pinpoint the source of the first infection.
Destroying infected fowl is the best way to contain the outbreak, according to WHO.
Thai officials have said slaughters of more than 26 million chickens have brought the disease largely under control there, while Vietnam has said its outbreak is easing. In Pakistan, U. N. officials said the disease has been contained. But the U. N. Food and Agriculture Organization said it would take much longer to bring the region's outbreak under control.
"I would have thought that we'd be looking at a period of six months...but it could be as long as two years," FAO animal health officer Peter Roeder said in Geneva. In New Jersey, state veterinarian Nancy Halpern said the markets likely got the virus from one of their many farms and distributors. New Jersey has about 35 live chicken markets.
单选题 Which of the following is true according to WHO?
【正确答案】 C
【答案解析】选项A的内容出现在第1段,但不是来自于世界卫生组织。选项B可以排除,因为第2段中世界卫生组织说没有迹象显示很容易在人群中传播的混合致命病毒已出现(no sign of a killer hybrid virus that could easily pass between people)。选项D也可以排除,因为在第3段中,世界卫生组织说有证据表明禽流感和人类流感的基因还未混合(there was no mixing of genes between the bird flu strain and human flu)。第11段所述世界卫生组织的说法以及文章涉及到的一些国家控制禽流感的做法明确证实了选项C是正确的。
单选题 Which one of the following countries has not been infected with human bird flu?
【正确答案】 A
【答案解析】从第8段可以看出新加坡未受到感染(believed free of bird flu),他之所以制定杀鸡计划是为了防止禽流感的爆发,而其他几个国家都是已经被感染了。因此选A。
单选题 According to the passage, which one of the following countries has not announced the containment of bird flu?
【正确答案】 D
【答案解析】第12段中,泰国、越南和巴基斯坦的官员都已经宣布控制了本国的禽流感爆发,而文中并没有相关美国官员的话明确证实美国是否已经控制禽流感,所以选D。
单选题 Which of the following is false according to the passage?
【正确答案】 B
【答案解析】对于文章开头提到的泰国新出现的3名病例,文章在第7段中说有两名已经恢复,而第3名仍在接受重症特别护理(in intensive care),并没有死亡,所以B是错误的,应当选B。
单选题 This passage is most likely to come from ______ .
【正确答案】 A
【答案解析】本文带有明显的新闻体风格,很可能摘自一篇新闻,而没有任何证据表明它来自于一本科学书籍、世界卫生组织的调查或者是联合国粮农组织的报告。所以 A项为正确答案。