A:抗原和抗体
B:抗体和抗原
C:抗原和抗原
D:抗体和抗体
—I often do shopping ____ her.
在下图梯形中,甲面积( )乙面积
下图中的人( )
— Did you listen to Li Yundi _____ the piano yesterday evening?
— Yes. He played _____ and all the audience clapped loudly at the end.