观察下列图形规律：当n=____时，图形“△”的个数是“●”的个数的2倍．

已知函数$f\left(x\right)$的图象向右平移$a\left(a>0\right)$个单位后关于$x=a+1$对称，当$x_2>x_1>1$时，$f\left(x_2\right)-f\left(x_1\right)\left(x_2-x_1\right)$＜0恒成立，设$a=f\left(-\frac{1}{2}\right),b=f\left(2\right),c=f\left(e\right)$，则$a,b,c$的大小关系为（   ）

      This is a s____ of twin brothers, Justin and Paul. Their friend Susan calls them for h____ . Justin and Paul drive to Hill Building q____ . Three man in police uniform p____  them into a green van. They are not p____ . They are the robbers. The twin brothers aren’t a____. Paul opens the back door of the van w____  a knife. They take different r____ to the police station. They meet the robbers  a ____  in the police station. They are s____ . The policemen stop the van because the back door of the van is open.

下列选项中属于构建社会主义和谐社会的要求的是 （   ）
①民主法治、公平正义      ②诚信友爱、充满活力
③爱国守法、明礼诚信      ④安定有序、 人与自然和谐相处