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