造成“世界屋脊”和“鱼米之乡”农业生产差异的根本原因是( )
A:纬度位置
B:地形地势
C:风俗习惯
D:地理位置
—Is first impression very important?
—Yes, it is, because you never get second chance to make first impression.
点A(2,﹣3)关于原点对称的点的坐标是( )
1576+8970=____
865437-786952=____