单选题:CDCconsideredtheoutbreakofWestNileinl999asaconsequenceof

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题目内容:
CDCconsideredtheoutbreakofWestNileinl999asaconsequenceof A.theabolitionofthemosquito—controlprograms.
B.thesurvivingmosquito—borneinfections.
C.theabuseofsome$50millioninfunds.
D.itsfailuretoconquermosquito—bornediseases.

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