—Are these pictures all ours?
—Yes, _______ ______!
A:they are
B:you are
C:there are
常温下,Ka (HCOOH)=1.77×10﹣4,Ka (CH3COOH)=1.75×10﹣5,Kb (NH3•H2O)=1.76×10﹣5,下列说法正确的是( )
我们与父母进行沟通,关键是( )