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Recently,old Diseases Once Under Control Are Returning in New,more Serious

Question 20

Multiple Choice

Recently,old diseases once under control are returning in new,more serious forms.This is because


A) we have lost our ability to make effective medicines.
B) disease organisms are themselves evolving.
C) government funding for medical research is down.
D) people have become complacent and are less likely to be immunized.

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