传染病流行必需具备的基本条件是()
A、有传染来源
B、有能实现的传播途径
C、病原体必须从传染来源排出
D、有易感人群
E、以上都是
参考答案:A, B, D
People read newspapers and magazines in order to keep themselves _________ of
what is going on in the world outside.
A.connected
B.known
C.updated
D.informed
面神经麻痹多见于()。
A.牛
B.马
C.羊
D.猪
E.猫