我国地势的总特征是（ ）
A．东高西低
B．西高东低
C．北高南低
D．南高北低
我国的地势西高东低，呈三级阶梯状分布．
故选：B．
After retirement, learning a musical instrument may be harder than ______ when you were a kid.
A．it may
B．it was
C．it does
D．it did
派出机构
