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Because Flu Virus Seems Prone to Winter Outbreaks

Question 21

Multiple Choice

Because flu virus seems prone to winter outbreaks


A) each successive winter can be worse than the last.
B) the disease usually only lasts one winter because summer kills off the virus.
C) the appearance of the disease often switches hemispheres north to south.
D) the disease only appeared in the very bad winters in the 1910s.

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