将过量的CO₂分别通入到下列溶液中，最终溶液中有白色沉淀析出的是

①CaCl₂溶液；②Na₂SiO₃溶液；③Ca(OH)₂溶液；④饱和Na₂CO₃溶液

A．①②③④

B．②③

C．①②③

D．②④

----Mum, I’m afraid I won’t do well in the coming test.

----Honey, ____ more careful, ____ you will make it.

A．is, so

B．be, and

C．be, then

D．being, and