下列反应中，属于置换反应的是（　　）

A．	$\mathit{CaC}{O}_3+H_{2}O+C{O}_2═\mathit{Ca}（\mathit{HC}{O}_3{）}_2$
B．	$\mathit{CuC}{l}_2\begin{array}{c}\underset{¯}{\underset{¯}{\begin{array}{ccc}& \mathit{电解}& \end{array}}}\\ \end{array}\mathit{Cu}+C{l}_2\uparrow$
C．	$3\mathit{CO}+F{e}_2{O}_3\begin{array}{c}\underset{¯}{\underset{¯}{\begin{array}{ccc}& \mathit{高温}& \end{array}}}\\ \end{array}2\mathit{Fe}+3C{O}_2$
D．	$\mathit{CuS}{O}_4+\mathit{Fe}═\mathit{FeS}{O}_4+\mathit{Cu}$