Hu Mei, ___ daughter of a teacher’s family, was made ___ monitor of the class at the meeting.

A．the; a

B．the; 不填

C．a; the

D．the; the

把1 mL 0.1 mol/L的H₂SO₄加水稀释成2 L溶液，在此溶液中由水电离产生的H^＋，其浓度接近于

A．1×10^－4 mol/L

B．1×10^－8 mol/L

C．1×10^－11 mol/L

D．1×10^－10 mol/L