为规范房地产开发企业的市场活动，《房地产开发企业资质管理规定》将房地产开发企业划分为 ( )个资质等级。
A．3B．4C．5D．6
参考答案：B
The boy my invitation,which surprised me. [ ]
A. turned down
B. took down
C. got down
D. cut down
目前各新闻单位选用职工的方式主要有哪几种
