在25℃时，向50.00 mL未知浓度的CH3COOH溶液中逐滴加入0.5 mol·L-1的NaOH溶液。滴定过程中，溶液的pH与滴入NaOH溶液体积的关系如图所示，则下列说法中，不正确的是
| A．①点所示溶液的导电能力弱于②点 |
| B．图中点③所示溶液中，c(CH3COO-)<c(Na+) |
| C．图中点①所示溶液中水的电离程度大于点③所示溶液中水的电离程度 |
| D．滴定过程中的某点，会有c(Na+)=c(CH3COO-)>c(H+) =c(OH-)的关系存在 |
Progress______ so far very good and we are sure that the work will be finished on time.
| A．was | B．had been | C．has been | D．will be |
Charles was alone at home, with_______ looking after him.
| A．someone | B．anyone | C．not one | D．no one |
It is often ______ that human beings are naturally equipped to speak.
| A．said | B．to say | C．saying | D．being said |
I can’t leave. She told me that I ______ stay here until she comes back.
| A．can | B．must | C．will | D．may |
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |