氧化铁是一种由（）与Fe2O3、Fe3O4等组成的氧化物
A、Fe（OH）3
B、FeO
C、FeSO4
参考答案：B
自行车和三轮车共有26辆，共有60个轮子，三轮车有______辆．
I want to know_________. [ ]
A. what is his name
B. what's his name
C. that his name is
D. what his name is
