下列各组中的两个单项式属于同类项的是[ ]
A．0.2a2b与0.2ab2
B．11abc与9bc
C．3m2n3与﹣n3m2
D．62与x2
答案：C
The 16th Asian Games started ________ November 12 th, 2010 in Guangzhou.
A．on
B．at
C．in
D．by
货运事故分几类、其内容？
