填空题

Fortunately we can make vaccines for the H5N1 strain, and get them tested and manufactured in time for a pandemic.

【参考答案】

N

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填空题

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

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.