So far the majority of cloned animals have suffered from some different serious disorders, ______ died soon after birth.

A．many of which

B．many of whom

C．many of them

D．many of that

临床确诊类风湿关节炎患者，近日来主诉右侧膝关节肿胀、无力。

患者行右侧膝关节超声检查，其主要目的是（）.

A.确诊类风湿关节炎

B.除外骨关节炎

C.明确有无关节积液及滑膜增生

D.明确有无肌腱撕裂

E.明确有无关节游离体