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13、It is ________ that the WHO gave a warning to the public immediately when the virus(病毒) of H1N1 first hit Mexico in April, 2009.

A.unwise            B.sure               C.certain             D.unlikely

13、C

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It is ________ that the WHO gave a warning to the public immediately when the virus(病毒) of H1N1 first hit Mexico in April, 2009.

A.unwise            B.sure               C.certain             D.unlikely

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