一 Amy, can we give away these soft toys? We them for many years.
一 Mum, but l want to keep the bear.
A:bought
B:had
C:have bought
D:have had
廖智老师的感人事迹对我们有什么启示?
梯形的中位线长为15 cm,一条对角线把中位线分成3∶2两段,那么梯形的两底长分别为( )
下列除杂质的方法不可行的是( )