题干
There is sugar in my coffee. It's too sweet.
A：too much
B：too many
C：too few
答案(点此获取答案解析）
A
There is sugar in my coffee. It's too sweet.
A：too much
B：too many
C：too few
离子在一定条件下可把Mn2＋氧化成
，若反应后
变成
，又知反应中氧化剂与还原剂的离子个数比为5:2，则