He was chosen chairman of the Trade Union and he was happy to ________ the role.[ ]

A. take off  

B. take up

C. take over

D. take in

以下费用属于社会保障费的是（）

A.养老保险费

B.失业保险费

C.医疗保险费

D.住房公积金

E.职工教育经费