化学方程式是世界通用的化学语言，正确的化学方程式是（ ）
A：3Fe+O2Fe3O4
B：2KClO32KCl+O2↑
C：2NaOH+SO2→Na2SO4+H2O
D：BaCl2+Na2CO3→BaCO3↓+2NaCl
关于分子和原子的说法，正确的是( )
磁铁____磁力最强，叫____。磁铁磁力分布的区域称为____。
A: Hello, Kate. ____
B: That's beautiful. I like it.
A: ____
B: I need four.
B: They're funny.
A: You can also buy a T-shirt for your friend.
B: ____
A. Good idea.
B. What about these caps?
C. Come and look at this cap.
D. How many caps do you need?
E. Let's go.
