我国物业管理是在城市房地产综合开发和住房制度改革背景下，通过实行( )而逐渐发展起来的。

A．市场化制度

B．商品化制度

C．社会化

D．专业化

The owner of the mine was ____________ to twenty years because he had broken the law to employ children as miners.

A．sentenced

B．trapped

C．sheltered

D．buried