题目内容：
流行性乙脑是由乙脑病毒感染所致，多发于（）A．夏秋季流行
B．冬春季流行
C．一年四季均可流行
D．春秋季流行
参考答案：
单选：流行性乙脑是由乙脑病毒感染所致，多发于（）A．夏秋季流行B．冬春季流行C．一年四季均可流行D．春秋季流行
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A．夏秋季流行
B．冬春季流行
C．一年四季均可流行
D．春秋季流行
A．夏秋季流行
B．冬春季流行
C．一年四季均可流行
D．春秋季流行
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