△ABO与△A₁B₁O在平面直角坐标系中的位置如图所示，它们关于点O成中心对称，其中点A（5，2），则点A₁的坐标是（　　）

请解答下列各题：

如图2所示电路中，L是电阻不计的电感器，C是电容器，闭合电键S，待电路达到稳定状态后，再断开开关S，电路中将产生电磁振荡．如果规定电感器L中的电流方向从A到B为正，断开开关的时刻t＝0，那么图中能正确表示电感线圈中电流i随时间t变化规律的是(　　)

阅读下面短文，用所给动词的适当形式填空，使短文完整、通顺。每空不限一词。
     Rose is one of the funniest girls in her class. She looks like a boy, and she is good at ____ (perform). So she____ (choose) to play Harry Potter by her classmates last week. She said happily, “I'm sure that I ____ ( do )the job well because I____ (see) the movie many times already.”
    Dick, one of Rose's best classmates, is also an actor in the play. He____(like) to perform the play with Rose. He said, “We are confident that we____ (do) well in our school art festival next week.”
    Mrs. Smith, their teacher, pays much attention to their play. She often____(encourage) them. Yesterday afternoon when she ____ (watch) their performance, she took photos of them. And the photos____(send) to their headteacher next month. They hope their performance ____ (be) the best.

经济重心是指区域空间中经济力量能够维持均衡的点。目前，广东省是中国经济总量最大、最具活力的地区之一，改革开放以来，广东省经济重心空间变化显著。图3示意1979—2014年广东省经济重心空间动态演变轨迹，

下图示意1979—2014年广东省经济重心分布。改革开放以来，广东省区域经济（      ）