—Is it a pen?
—_______．[ ]
A. Yes, it isn't
B. No, it is
C. No, it isn't
答案：C
元宵∶汤圆
A．清明∶龙舟
B．冬至∶面条
C．重阳∶菊花
D．端午∶茱萸
我国汽油机油标准GB11121—2006包括几个质量等级？
