人民代表大会制度的核心内容是( )。

A．一切权力属于民
B． * * 党领导人民当家作主
C．国体和政体的统一
D．人民民主专政的国家性质

Mary often does some translation work to earn extra money, which      half of her income.

A．makes for

B．counts on

C．accounts for

D．consists in