参与Ⅱ型超敏反应的主要抗体为 （）
A.IgA
B.IgE
C.sIgA
D.IgG和IgM
E.IgG重链
参考答案：D
I am certain by no means ________ his word since he has promised an amount of money to the poor.
A．he will break
B．will he break
C．broke
D．did he break
中级型轿车发动机的排量是（）L/s。
A.≤1.0
B.1.0～1.6
C.1.6～2.5
D.2.5～3.5
