—I . But I had some urgent business to deal with then.
某人因车祸失血过多危及生命需大量输血,经化验知其血型为A型,医生给他输血时应输的血型是( )
My grandfather ____ ____ ____ a teacher.
— Because he was ________ to reach the apples on the tree.
如图,长方体ABCD﹣A1B1C1D1中|AB|=2|AD|=2|AA1|,将可视为质点的小球从顶点A在∠BAD所在范围内(包括边界)分别沿不同方向水平抛出,落点都在A1B1C1D1范围内(包括边界).不计空气阻力,以A1B1C1D1所在水平面为重力势能参考平面,则小球( )