如图为“中国的疆域及邻国分布图”,据图完成下面小题:
先化简,再求值:3x2y﹣2x2﹣(xy2﹣3x2y)﹣4xy2,其中|x|=2,y=12,且xy<0.
It's raining now. I have to go to school .
I ____ (be sure) my friends will come to the party tomorrow.
为三国鼎立形成奠定基础的战役是( )