My sister was born _____ a spring morning. [ ]
A. on
B. in
C. at
D. for
答案：A
凡是能够产生、持有、载有情报或传递透露情报的任务系统均可称为_________。
被收容教育人员请假离所的期限一般不超过（）天。
A.3
B.7
C.10
D.15
