美国宪法规定“总统可以否决国会通过的法律”“国会可以以三分之二多数通过总统否决的法律”。这体现的原则是[ ]

A．联邦制原则、民主原则

B．分权制衡原则、民主原则

C．自由平等原则、权力制衡原则

D．中央集权原则、分权原则

—_____ your brother often watch TV at home?  

—No, he _____.[ ]

A. Do, don't

B. Is, isn't

C. Does, does

D. Does, doesn't