A:接种疫苗后机体会产生相应的抗体
B:抗体是一种蛋白质
C:抗体能直接清除宿主细胞内的抗原
D:抗体由浆细胞产生
— Lily is about the competition.
— Yes, she is afraid that she won't win.
下列运算正确的是( )
1 > ____ ____ < 8
5 = ____ ____ < 3 < ____