A:青藏高原——黄土深厚,千沟万壑
B:内蒙古高原——地势坦荡,一望无际
C:黄土高原——石灰岩广布,地表崎岖
D:云贵高原——雪山连绵,冰川广布
—Yes. They are in the living room.
The population in the USA is about _______ it is in China.