小组
参考答案：由两个以上个人组成，具有明显的社会性、归属性、激励性和互动性等特征的动态群体。
颤证的特征性症状是
A．四肢抽搐
B．头摇肢颤
C．项背强急
D．肢体痿软
E．肢节拘急
All the children should have clean water _______ they can be healthy. [ ]
A. because of
B. instead of
C. so that
D. even though
