A:东方
B:西方
C:南方
D:北方
若分式-3aba2+b2中a和b都扩大到原来的4倍,则分式的值( )
求下面各比的比值.
—Yes, and most of them __in the western part of China.
— Excuse me, sir. Please don't take photos in the museum. Look at the sign .
— I'm sorry. I didn't notice it just now.
读一读,选出不同一类的单词。