物质的量浓度相等的Na2S和NaHS的混合液中,下列关系一定正确( )A. C(Na+)=C(S2-)+C(HS-)+C(H2S) B. C(Na+) + C(H+) = 2C(S2-) + C(HS-) + C(OH-)C. C(Na+)>C(HS-)=C(S2-)>C(OH-) D. C(H+)< C(HS-)<C(OH-)<C(Na+) 答案:B解析:略 —I’m hungry, Mum. ( )—Do you want any cakes ________ biscuits?A. and B. / C. or