确定需要危机恢复的所有潜在对象需要全面地了解信息和进行（）
A.集体讨论
B.专家小组决策
C.民主决策
D.权威决策
参考答案：A
Tom played tennis with his brothers _ Saturday morning. [ ]
A. in
B. on
C. for
D. to
隔离
