—Mary ______ her elder sister.  

—I agree with you. They are both beautiful and outgoing.   [ ]

A. looks after            

B. takes after  

C. looks like              

D. takes pride in

除去SO₂中的SO₃，并得到纯净的SO₂，最好使混合气体通过[ ]

A．水

B．NaHSO₃饱和溶液

C．NaHCO₃饱和溶液

D．98．3%浓硫酸