These examples show that all individuals，      they are rich or poor，should be responsible        they are involved in law．

A．if；when

B．if；as long as．

C．whether；as long as

D．whether；since

蛋白质的营养作用可概括为三个方面，即（）。

A、参与代谢的调节作用

B、促进脂肪的消化吸收

C、提供修补与构成畜体组织器官的物质

D、提供能量