设 A 是 2 阶矩阵，且
正确答案：
1
答案解析：
暂无解析
Some25,000peoplewerereported______intheeverrecordedworstearthquakeinIran,whichoccurredlatethismonth.
Undernocircumstance_____totellliestoparents.
It_____quiteafewyears_____theaccusedwasdeclaredinnocentandsetfree.
Everyonehopesthatwecandosomethingtomakethingsbetter,sowecan'thelp______underthestress.
Itisthenews____mostparentsofthehopethatthereisasafeandsociallyapprovedroadtoakindoflifetheythemselveshavenothad,buttheirchildrencan.