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17、

 A / H1N1 flu virus has threatened the whole world that scientists try to ______.

   A. give it up       B. make it up     C. make it out     D. give it out

 

17、C

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 A / H1N1 flu virus has threatened the whole world that scientists try to ______.

   A. give it up       B. make it up     C. make it out     D. give it out

 

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