A:left out
B:left over
C:left alone
D:left behind
我国各民族的分布特征是( )
秦灭六国后,全国统一使用的货币是( )
已知a→=2,1,b→=3,λ,,若2a→-b→⊥b→,则λ的值为 ( )
Look, there is ________ onion in the kitchen. We can cook it for dinner.