有人说“隋朝，犹如一颗流星划过历史的夜空，时间虽然短暂却光芒四射。”下列对“光芒四射”的理解不正确的是（ ）
A：使南北重新统一
B：隋炀帝的励精图治
C：隋炀帝的科举制度正式形成
D：大运河是古代世界上最长的运河
—Jenny and Joe have________recently.
—How come？As far as I know，they have been good friends for many years.
我参加过的社区志愿活动有____。
How much will the magazine pay for a joke to be published?
