— What class are you in?
— ______________.
A:I'm in Class three Grade seven.
B:I'm in Class Three Grade Seven.
C:I'm in Grade seven Class three.
D:I'm in Grade Seven Class Three.
乌贼遇到敌害时,会释放出大量的墨汁,这说明( )
照样子写词语。
密密麻麻
____ ____ ____
先化简,再求值:x2-1x-12﹣xx-1÷12x,请选取一个适当的x的数值代入求值.