用高锰酸钾滴定法测定铁，滴定必须在（）介质中进行。
A.硝酸
B.硫酸
C.盐酸
参考答案：B
25．Children often form some bad habits, ____________remain with them as ling as they live.
A．some of them
B．some of which
C．any of them
D．any of which
