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  3. The World Health【B1】______ says avian influenza could become a worldwide threat unless governments act now to stop it. Officials

The World Health【B1】______ says avian influenza could become a worldwide threat unless governments act now to stop it. Officials

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问题     The World Health【B1】______ says avian influenza could become a worldwide threat unless governments act now to stop it. Officials at the United Nations【B2】______ warn that bird flu could kill as many as seven million people. They say the number of deaths would depend on the【B3】______ of the virus once it entered the general population. So far, avian influenza has mostly【B4】______  people who have been around infected birds and their waste. The W.H.O. said at the end of September that it had reports of 60 deaths. These were among 160【B5】______ cases since December, 2003. The deaths were【B6】______ in Vietnam.
    Fifteen flu viruses infect birds. Officials are most【B7】______ about the h-five-n-one virus. It could spread easily from person to person if it mixes with human flu virus. That might happen if a person or an animal, such as a pig, becomes infected with both human and avian flu. The body has no【B8】______ against bird flu.
    Anti-viral medicine has been used with some success to treat bird flu. Scientists have a vaccine that might protect against the virus.【B9】______ .
    Also last week, scientists in the United States announced that they have remade the so-called Spanish flu virus.【B10】______ .
    The scientists say they found that the Spanish flu came from birds.【B11】______ . They also hope to find ways to protect against any big outbreak.
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