一定浓度的硝酸与Cu2S反应,生成Cu(NO3)2、CuSO4、NO2、NO和H2O。当产物中n(NO2)∶n(NO)=1∶1时,下列说法正确的是( )
It’s high time you had your hair cut ; it’s getting _______ .
My friend showed me round the town, ______ was very kind of him.
They use computers to keep the traffic _______ smoothly.
If you leave the club, you will not be_____back in .
What I need is_____ book that contains ______ABC of oil painting.