孔子说：“见贤思齐焉，见不贤而内省也。”这表明，做人应（    ）
①铸就心中良知的标尺                                     ②树立正确的是非善恶观
③选择善良正义的人作为楷模                         ④自省所见到的非正义行为

若x﹣y=$\sqrt{2}$﹣1，xy=$\sqrt{2}$，则代数式（x+1）（y﹣1）的值为____ 

    ____crowd of more than 22,000 people gathered near Las Vegas' famous Mandalay Bay Hotel____the Route 91 Harvest Festival. Without____(expect), from the hotel's 32^nd floor, a gunman opened fire on the people below,____ (kill)59 people and at least 500 injured. It was the most____(dead)shooting in US history. President Donald Trump described____as “an act of pure evil”. He ordered US flags to be____(fly)at half-staff to honor those____died. “In moments of tragedy and horror, America comes together as one. And it always ____(have),” Trump said____(Politician) around the world offered their support for the United States.

下列叙述正确的是（　　）