满足员工社会需要的激励手段是（）。
A.交流思想
B.丰富的文化娱乐活动
C.多种形式的集体活动
D.退休制度
E.用工制度
参考答案：A, B, C
一个数的30%是3，它的50%是（ ）。
If they broke the law, they for up to two years.
A．are put into prison
B．were put into prison
C．are put into the prison
D．were put into the prison
