有史料记载，汉代“文帝之时，纵民得铸钱、冶铁、煮盐。”因而出现一些富商大贾“冶铸煮盐，财或累万金。”此现象说明，当时(　　)

在平面直角坐标系中，以点（2，3）为圆心，2为半径的圆必定（   ）

It's eight o'clock. The people in Moscow　　　having afternoon tea.

阅读下面这首诗。
                                                                                                                                       秋夜山居
                                                                                                                                       唐•施肩吾
                                                                                                                去雁声遥人语绝，谁家素机①织新雪。
                                                                                                                 秋山野客②醉醒时，百尺老松衔半月。
       【注释】①素机：织布机。②野客：离乡在外的游客。