填空题

The outbreak of the strain of H5N1 flu in summer 2004, and by mid-April 2005, had killed ______ people.

【参考答案】

51

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热门试题

填空题

It is as risky as the natural evolution of the virus that the scientists breed contagiousness into H5N1 to see if it is likely to happen.

填空题

H5N1 could evolve into a potential pandemic that way, or by recombining with human flu.