由于（）产生的误差称为终点误差。
A.化学计量点与滴定终点不一致
B.滴定管没有校正
C.标准溶液的浓度不准确
D.指示剂选择不当
参考答案：A
— Does your uncle still smoke?
— He given it up. It's two years ever since he _____. [ ]
A. can't have; smoked;
B. may have; smoked
C. should have; has smoked
D. should have; didn't smoke
医学上的金元四大家是指（）。
A.唐慎微
B.刘完素
C.张从正
D.李东垣
E.朱震亨
