读“澳大利亚人口分布图”, 澳大利亚大陆自西向东可明显分为三大地形区,西部是( )
A:低矮的高原
B:一望无际的平原
C:大分水岭
D:大自流盆地
I have three stamps, one is from Canada, one is from America, ___ is from China.