正方体ABCD﹣A₁B₁C₁D₁中E为棱BB₁的中点（如图），用过点A，E，C₁的平面截去该正方体的上半部分，则剩余几何体的左视图为（　　）

（1）解方程：x²+3=3（x+1）

（2）解方程：4x（2x﹣1）=3（2x﹣1）

先通读下面的短文，掌握其大意，然后从A、B、C、D四个选项中选择可以填入空白处的最佳答案。

    Mr．and Mrs．Black want to go to Beijing．But their dog Bobby1go there with them.So they2him in a pet shop．

    Mr．and Mrs．Black get back home3Beijing very late at night on Sunday,4they leave Bobby at shop.On Monday morning，Mr.Black5dog back in his car．When he gets home，he says to his wife，“Bobby is barking(吠叫)all the time．I think he wants to6me something．Doesn't he like the7or doesn't he feel well?”

    Mrs．Black8 the dog carefully(仔细地)and then says.“You're9．He wants to tell you something．He wants to tell10that he isn't Bobby．”

如图所示，从倾角为θ的斜面上某点先后将同一小球以不同的初速度水平抛出，小球均落在斜面上．当抛出的速度为ν₁时，小球到达斜面时速度方向与斜面的夹角为α₁；当抛出速度为ν₂时，小球到达斜面时速度方向与斜面的夹角为α₂，下列说法中正确的是（   ）