我国地形、地势总的特点是( )①地势西高东低②河流、湖泊众多③呈阶梯状分布④森林覆盖面积大⑤地形复杂多样⑥山区面积广大
—It's very nice of you. I appreciated ____ to the party. (invite)
一次函数y=x+3与y=-2x+6的图象的交点组成的集合是( )