社会保障对美国而言,是一种“安全网”。
参考答案:对
The villagers were ______ by the news of the criminal's release from the prison.
A.indignant
B.puzzled
C.overjoyed
D.elusive
BSP认为,【 】和企业过程是定义企业信息系统总体结构的基础。