将点A(1,1)先向左平移2个单位,再向下平移3个单位得到点B,则点B的坐标是____.
He said he was very sorry because it was _______ his power to make the final decision. _______, I had to turn to others for help.
下列最具有生物多样性的地区是( )
在我们的生活和生产中,经常要对物质进行分类。如以下物品可分成两类:①铅笔芯、铝质易拉罐、铜导线 ②塑料笔套、橡皮、玻璃。这两类物品分别属于( )