We need an effective strategy to help children living in        poverty to have the opportunity to receive     good education．

A．/;a

B．a;/

C．/,the

D．the; a

合同当事人一方并不必然履行给付义务，而只有当合同中约定的条件具备或合同约定的事件发生时才履行，说明保险合同是（）

A、双务合同

B、附合合同

C、射幸合同

D、有偿合同