关于化学方程式3Fe+2O2 点燃 . Fe3O4，四位同学有如下所示的四种说法，其中错误的是（ ）
A．
B．
C．
D．
答案：C
—Where is Sam? Do you know?
—Look! He's ______ on the beach. How cool! [ ]
A. swimming
B. lying
C. looking
性格
