在MnO2+4HCl △ . MnCl2+2H2O+Cl2↑反应中，二氧化锰是（ ）
A．氧化剂
B．催化剂
C．还原剂
D．无法判断
答案：A
My book is _________yours. [ ]
A. so interesting as
B. as more interesting as
C. not so interesting as
D. not as interesting than
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