社会群体又分为初级社会群体与()。
参考答案:次级社会群体
计算机病毒通常具有的特征是()。
A.潜伏性
B.逻辑性
C.变种性
D.隐藏性
.-It was snowing heavily last night. Is everyone here now?
-Yes, and _____ of us was late for school this morning.
A.none
B.either
C.neither
D.all