A:pear
B:lemon
化简并求值:x(x﹣2)+(x+1)2,其中x=﹣2.
The twins didn't go to the theatre, they _______ the light music all night.
如图,甲、乙两部分相比,( )
①滴加Mg(NO3)2溶液 ②过滤 ③滴加AgNO3溶液 ④滴加Ba(NO3)2溶液。