某病原体第一次感染人体，人体不会产生相应的[ ]
A．浆细胞
B．过敏反应
C．记忆细胞
D．免疫反应
答案：B
So far all cloned animals have suffered from some different serious disorders, _____ dying soon after birth. [ ]
A. many of which
B. many of whom
C. many of them
D. many of that
2,6,12,20,30，( )
A．38
B．40
C．42
D．44
