题目: —Do you think it is important for us __ English? —Yes, I think so. [ ]A. learn B. to learn C. learns D. learning 答案: 答案:B
题型:选择题 已知下列分子或离子在酸性条件下都能氧化KI,自身发生如下变化: H2O2→H2O; IO3-→I ;MnO4-→Mn2+ ;HNO2→NO 如果分别用等物质的量的这些物质氧化足量的KI,得到I2最多的是 [ ]A.H2O2 B.IO3- C.MnO4- D.HNO2 查看答案